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Lapis-Systematik

VIII SILIKATE

VIII/J Gerüstsilikate (mit Zeolithen)

VIII/J.01 Ohne tetraederfremde Anionen

Lisetit Na2CaAl4Si4O16 orthorhombisch Pbc21 mm2 VIII/J.01-010

VIII/J.02 Ohne tetraederfremde Anionen

Nephelin Na3K(Al4Si4O16) hexagonal P63 6 VIII/J.02-010
Kalsilit KAlSiO4 hexagonal P63 6 VIII/J.02-020
Megakalsilit K[AlSiO4] hexagonal P63 6 VIII/J.02-025
Trikalsilit K2NaAl3(SiO4)3 hexagonal P63 6 VIII/J.02-030
Panunzit K3Na(AlSiO4)4 hexagonal P63 6 VIII/J.02-040
Kaliophilit KAlSiO4 hexagonal P6322, P63/m 622, 6/m VIII/J.02-050
Yoshiokait Ca(Al,Si)2O4 trigonal P3 3 VIII/J.02-060
Malinkoit Na[BSiO4] hexagonal P63 6 VIII/J.02-070

VIII/J.03 Ohne tetraederfremde Anionen

Petalit LiAlSi4O10 monoklin P2/a 2/m VIII/J.03-010
Virgilit LixAlxSi3-xO6 hexagonal, hexagonal P6222, P6422 622, 622 VIII/J.03-020
Lisitsynit K[BSi2O6] orthorhombisch P212121 222 VIII/J.03-030

VIII/J.04 Ohne tetraederfremde Anionen

Chkalovit Na2BeSi2O6 orthorhombisch Fdd2 mm2 VIII/J.04-010

VIII/J.05 Ohne tetraederfremde Anionen

Leucit K(AlSi2)O6 tetragonal I41/a 4/m VIII/J.05-010
Ammonioleucit (NH4,K)(Si2Al)O6 tetragonal I41/a 4/m VIII/J.05-020

VIII/J.06 Ohne tetraederfremde Anionen; Feldspat-Gruppe

Buddingtonit (NH4)AlSi3O8·0.5 H2O monoklin P21, P21/m 2, 2/m VIII/J.06-010
Kokchetavit KAlSi3O8 hexagonal P6/mmm 6/mmm VIII/J.06-015
Sanidin (K,Na)(Si,Al)4O8 monoklin C2/m 2/m VIII/J.06-020
Mikroklin KAlSi3O8 triklin C1 1 VIII/J.06-030
Rubiklin (Rb,K)[AlSi3O8] triklin P1 1 VIII/J.06-035
Orthoklas KAlSi3O8 monoklin C2/m 2/m VIII/J.06-040
Hyalophan (K,Ba)Al(Si,Al)3O8 monoklin C2/m 2/m VIII/J.06-050
Celsian BaAl2Si2O8 monoklin I2/c 2/m VIII/J.06-060
Paracelsian BaAl2Si2O8 monoklin P21/a 2/m VIII/J.06-070
Slawsonit (Sr,Ca)Al2Si2O8 monoklin P21/a 2/m VIII/J.06-080

VIII/J.07 Ohne tetraederfremde Anionen; Feldspat-Gruppe

Anorthoklas (Na,K)AlSi3O8 triklin C1 1 VIII/J.07-010
Albit NaAlSi3O8 triklin C1 1 VIII/J.07-020
Oligoklas (Na,Ca)(Si,Al)4O8 triklin C1 1 VIII/J.07-030
Andesin (Na,Ca)(Si,Al)4O8 triklin P1 1 VIII/J.07-040
Labradorit (Ca,Na)(Si,Al)4O8 triklin C1 1 VIII/J.07-050
Bytownit (Ca,Na)(Si,Al)4O8 triklin I1 1 VIII/J.07-060
Anorthit CaAl2Si2O8 triklin P1 1 VIII/J.07-070
Dmisteinbergit CaAl2Si2O8 hexagonal P6/mmm 6/mmm VIII/J.07-075
Lingunit (Na,Ca)AlSi3O8 tetragonal I4/m 4/m VIII/J.07-078
Kumdykolit NaAlSi3O8 orthorhombisch P2nn oder Pmnn mm2 oder mmm VIII/J.07-079
Svyatoslavit CaAl2Si2O8 orthorhombisch P21212 222 VIII/J.07-080
Stronalsit SrNa2Al4Si4O16 orthorhombisch Iba2 mm2 VIII/J.07-090
Banalsit BaNa2Al4Si4O16 orthorhombisch Iba2 mm2 VIII/J.07-100
Filatovit K[(Al,Zn)2(As,Si)2O8] monoklin I2/c 2/m VIII/J.07-110

VIII/J.08 Ohne tetraederfremde Anionen

Reedmergnerit NaBSi3O8 triklin C1 1 VIII/J.08-010
Danburit CaB2Si2O8 orthorhombisch Pnam mmm VIII/J.08-020
Pekovit SrB2Si2O8 orthorhombisch Pnma mmm VIII/J.08-030
Maleevit BaB2Si2O8 orthorhombisch Pnma mmm VIII/J.08-040

VIII/J.09 Mit tetraederfremden Anionen; Cancrinit-Gruppe

Hydroxycancrinit (Na,Ca,K)8(Al6Si6O24)(OH,CO3)2·2H2O hexagonal P63 6 VIII/J.09-005
Cancrinit Na6Ca2Al6Si6O24(CO3)2 hexagonal P63 6 VIII/J.09-010
Cancrisilit Na7Al5Si7O24(CO3)·3H2O hexagonal P63mc 6mm VIII/J.09-015
Depmeierit Na8[Al6Si6O24](PO4,CO3)1-x·3H2O {x < 0.5} hexagonal P63 6 VIII/J.09-016
Kyanoxalith Na7(Al5-6Si6-7O24)(C2O4)0.5-1.0·5H2O hexagonal P63 6 VIII/J.09-017
Davyn [(Na,K)6(SO4)0.5Cl][Ca2Cl2][(Si6Al6O24)] hexagonal P63 6 VIII/J.09-020
Quadridavyn (Na,K)6Ca2(Cl4)(Al6Si6O24) hexagonal P63/m 6/m VIII/J.09-025
Balliranoit (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) hexagonal P63 6 VIII/J.09-028
Mikrosommit (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4,CO3)2-3 hexagonal P63 6 VIII/J.09-030
Kircherit [Na90Ca36K18](Si108Al108O432)(SO4)36·6H2O trigonal R32 32 VIII/J.09-035
Fantappièit [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33·4H2O trigonal P3 3 VIII/J.09-036
Farneseit (Na37K9Ca10)(Si42Al42)O168(SO4)12·6H2O hexagonal P63/m 6/m VIII/J.09-040
Biachellait (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5·H2O trigonal P3 3 VIII/J.09-041
Giuseppettit Na42K16Ca6Si48Al48O192(SO4)10Cl2·5H2O trigonal P31c 3m VIII/J.09-043
Bystrit (Na,K)7Ca[Al6Si6O24](S)1.5·H2O trigonal P31c 3m VIII/J.09-045
Carbobystrit Na8[Al6Si6O24](CO3)·4H2O trigonal P31c 3m VIII/J.09-046
Alloriit (Na,K,Ca)24(Na,Ca)4Ca4(Si,Al)48O96(SO4)4(SO3,CO3)2(OH,Cl)2(H2O,OH)4 trigonal P31c 3m VIII/J.09-048
Afghanit (Na15K5Ca11)(Si24Al24O96)(SO4)6Cl6 trigonal P31c 3m VIII/J.09-050
Tounkit (Na,Ca,K)8[Cl|(SO4)2|Al6Si6O24] hexagonal P6222 622 VIII/J.09-055
Sacrofanit (Na,Ca,K)9(Si,Al)12O24[(OH)2,(SO4),(CO3),Cl2)]3·0.5 H2O hexagonal P62c 6m2 VIII/J.09-060
Marinellit (Na,K,Ca)48[Cl2|(SO4)8|(Al6Si6O24)6]·3H20 trigonal P31c 3m VIII/J.09-062
Pitiglianoit Na6K2Si6Al6O24(SO4)·2H2O hexagonal P63 6 VIII/J.09-065
Vishnevit Na8(Al6Si6)O24(SO4)·2H2O hexagonal P63 6 VIII/J.09-070
Franzinit (Na,K)6Ca2[(SO4)2|Al6Si6O24]·0.5H2O trigonal P321 32 VIII/J.09-080
Liottit (Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4 hexagonal P6 3m VIII/J.09-090
Wenkit Ba4Ca6(Si,Al)20O41(OH)2(SO4)3·H2O hexagonal P62m 6m2 VIII/J.09-100

VIII/J.10 Mit tetraederfremden Anionen

Leifit Na7Be2(Si15Al3)O39(F,OH)2 trigonal P3m1 3m VIII/J.10-010
Eirikit KNa6Be2(Si15Al3)O39F2 trigonal P3m1 3m VIII/J.10-015
Telyushenkoit (Cs,Na,K)Na6[F2|Be2Al3Si15O39] trigonal P3m1 3m VIII/J.10-020

VIII/J.11 Mit tetraederfremden Anionen; Sodalith-Gruppe

Tsaregorodtsevit N(CH3)4[AlSi5O12] orthorhombisch I222 222 VIII/J.11-005
Sodalith Na4Al3Si3O12Cl kubisch P43n 43m VIII/J.11-010
Nosean Na8Al6Si6O24(SO4) kubisch P43m 43m VIII/J.11-020
Haüyn Na3Ca(Si3Al3)O12(SO4) kubisch P43n 43m VIII/J.11-030
Lasurit Na3Ca(Si3Al3)O12S kubisch P43n 43m VIII/J.11-040
Vladimirivanovit Na6Ca2[Al6Si6O24](SO4,S3,S2,Cl)2·H2O orthorhombisch Pnaa mmm VIII/J.11-045
Tugtupit Na4AlBeSi4O12Cl tetragonal I4 4 VIII/J.11-050
Kamaishilith Ca2Al2SiO6(OH)2 tetragonal VIII/J.11-060
Bicchulith Ca2Al2SiO6(OH)2 kubisch I43m 43m VIII/J.11-070

VIII/J.12 Mit tetraederfremden Anionen

Danalith Fe2+4Be3(SiO4)3S kubisch P43n 43m VIII/J.12-010
Helvin Mn4Be3(SiO4)3S kubisch P43n 43m VIII/J.12-020
Genthelvin Zn4Be3(SiO4)3S kubisch P43n 43m VIII/J.12-030

VIII/J.13 Mit tetraederfremden Anionen; Skapolith-Reihe

Marialith Na4Al3Si9O24Cl tetragonal I4/m 4/m VIII/J.13-010
Mejonit Ca4Al6Si6O24CO3 tetragonal I4/m 4/m VIII/J.13-020
Silvialith Ca4[SO4|Al6Si6O24] VIII/J.13-025
Sarkolith Na4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl) tetragonal I4/m 4/m VIII/J.13-030
Kalborsit K6Al4Si6BO20(OH)4Cl tetragonal P421c 42m VIII/J.13-040

VIII/J.14 Mit tetraederfremden Anionen

Ussingit Na2AlSi3O8(OH) triklin P1 1 VIII/J.14-010

VIII/J.15 Gerüstsilikate mit Zeolithstruktur

Bikitait LiAlSi2O6·H2O triklin P1 1 VIII/J.15-010

VIII/J.16 Gerüstsilikate mit Zeolithstruktur

Hsianghualith Ca3Li2Be3(SiO4)3F2 kubisch I213 23 VIII/J.16-010

VIII/J.17 Gerüstsilikate mit Zeolithstruktur

Nabesit Na2[BeSi4O10]·4H2O orthorhombisch P212121 222 VIII/J.17-005
Lovdarit K2Na6Be4Si14O36·9H2O orthorhombisch Pma2 mm2 VIII/J.17-010
Gaultit Na4Zn2Si7O18·5H2O orthorhombisch F2dd mm2 VIII/J.17-020

VIII/J.18 Gerüstsilikate mit Zeolithstruktur

Parthéit Ca2(Si4Al4)O15(OH)2·4H2O monoklin C2/c 2/m VIII/J.18-010

VIII/J.19 Gerüstsilikate mit Zeolithstruktur

Roggianit Ca2BeAl2Si4O13(OH)2·nH2O (n<2.5) tetragonal I4/mcm 4/mmm VIII/J.19-010

VIII/J.20 Gerüstsilikate mit Zeolithstruktur

Krásnoit Ca3Al7.7Si3P4O22.9(OH)13.3F2·8H2O trigonal P3m1 3m VIII/J.20-005
Perhamit (Ca,Sr)3Al8[(OH)14|(PO4)4|Si3O8]·8 H2O trigonal P3m1 3m VIII/J.20-010
Tschörtnerit Ca4(K,Ca,Sr,Ba)3Cu3Al12Si12O48(OH)8·20H2O kubisch Fm3m m3m VIII/J.20-030
Lithosit K6Al4Si8O25·2H2O monoklin P21 2 VIII/J.20-035
Thornasit Na12Th3(Si8O19)4 ·18H2O trigonal R3c 3m VIII/J.20-040
Mendeleevit-(Ce) Cs6(REE22Ca6)(Si70O175)(OH,F)14(H2O)21 kubisch Pm3 m3 VIII/J.20-050

VIII/J.21 Zeolith-Gruppe; Faserzeolithe

Natrolith Na2(Si3Al2)O10·2H2O orthorhombisch Fdd2 mm2 VIII/J.21-010
Paranatrolith Na2(Si3Al2)O10·3H2O monoklin Cc m VIII/J.21-020
Gonnardit (Na,Ca)2(Si,Al)5O10·3H2O tetragonal I42d 42m VIII/J.21-040
Mesolith Na2Ca2(Si9Al6)O30·8H2O orthorhombisch Fdd2 mm2 VIII/J.21-050
Skolezit Ca(Si3Al2)O10·3H2O monoklin Cc m VIII/J.21-060
Thomsonit-Ca NaCa2(Al5Si5)O20·6H2O orthorhombisch Pncn mmm VIII/J.21-070
Thomsonit-Sr Na(Sr,Ca)2(Al5Si5)O20·6-7H2O orthorhombisch Pcnn mmm VIII/J.21-080

VIII/J.22 Zeolith-Gruppe; Faserzeolithe

Ferrierit-Na (Na,K)5(Si31Al5)O72·18H2O monoklin P21/n 2/m VIII/J.22-001
Ferrierit-K (K,Na)5(Si31Al5)O72·18H2O orthorhombisch Immm mmm VIII/J.22-003
Ferrierit-Mg [Mg2(K,Na)2Ca0.5](Si29Al7)O72·18H2O orthorhombisch Immm mmm VIII/J.22-005
Mutinait Na3Ca4(Si85Al11)O192·60H2O orthorhombisch Pnma mmm VIII/J.22-006
Terranovait NaCa(Al3Si17)O40·8H2O orthorhombisch Cmcm mmm VIII/J.22-007
Gottardiit Na3Mg3Ca5Al19Si117O272·93H2O orthorhombisch Cmca mmm VIII/J.22-008
Boggsit Na3Ca8(Si77Al19)O192·70H2O orthorhombisch Imma mmm VIII/J.22-010
Dachiardit-Na Na4(Si20,Al4)O48·13H2O monoklin C2/m 2/m VIII/J.22-015
Dachiardit-Ca (Ca,Na,K)4(Si,Al)24O48·13H2O monoklin C2/m 2/m VIII/J.22-020
Dachiardit-K K4(Si20Al4O48)·13H2O monoklin C2/m, Cm, C2 2/m, 2, m VIII/J.22-020
Direnzoit NaK6MgCa2(Al13Si47)O120·36H2O orthorhombisch Pmmn mmm VIII/J.22-025
Mordenit (Na2,Ca,K2)4(Al8Si40)O96·28H2O orthorhombisch Cmc21 mm2 VIII/J.22-030
Edingtonit Ba(Si3Al2)O10·4H2O orthorhombisch P21212 222 VIII/J.22-040
Laumontit Ca(Si4Al2)O12·4H2O monoklin C2/m 2/m VIII/J.22-050

VIII/J.23 Zeolith-Gruppe; Blätterzeolithe

Heulandit-Na (Na,Ca)6(Si,Al)36O72·24H2O monoklin C2/m, Cm, C2 2/m, m, 2 VIII/J.23-006
Heulandit-K (K,Ca,Na)5(Si27Al9)O72·24H2O monoklin C2/m, Cm, C2 2/m, m, 2 VIII/J.23-008
Heulandit-Ca (Ca,Na,K)5(Si27Al9)O72·26H2O monoklin C2/m 2/m VIII/J.23-010
Heulandit-Sr (Sr,Na,K)5(Si27Al9)O72·24H2O monoklin C2, , 2, m, 2 VIII/J.23-012
Heulandit-Ba (Ba,Ca,K,Na,Sr)5(Si27Al9)O72·22H2O monoklin C2/m 2/m VIII/J.23-014
Klinoptilolith-Na Na6(Si30Al6)O72·20H2O monoklin C2/m, , 2/m, 2, m VIII/J.23-018
Klinoptilolith-K K6(Si30Al6)O72·20H2O monoklin C2/m 2/m VIII/J.23-020
Klinoptilolith-Ca Ca3(Si30Al6)O72·20H2O monoklin C2/m, , 2/m, 2, m VIII/J.23-022
Stilbit-Na Na9(Si27Al9)O72·28H2O monoklin C2/m 2/m VIII/J.23-026
Stilbit-Ca (Ca0.5,Na,K)9(Si,Al)36O72·28H2O monoklin C2/m 2/m VIII/J.23-030
Barrerit (Na,K,Ca)8(Si,Al)36O72·26H2O orthorhombisch Amma mmm VIII/J.23-040
Stellerit Ca4(Si28Al8)O72·28H2O orthorhombisch Fmmm mmm VIII/J.23-050
Goosecreekit Ca(Si6Al2)O16·5H2O monoklin P21 2 VIII/J.23-060
Epistilbit Ca3(Si18Al6)O48·16H2O monoklin C2 2 VIII/J.23-070
Brewsterit-Sr (Sr,Ba,Ca)(Si6Al2)O16·5H2O monoklin P21/m 2/m VIII/J.23-080
Brewsterit-Ba (Ba,Sr,Ca)(Al2Si6)O16·5H2O monoklin , P21/m 2/m, 2 VIII/J.23-090

VIII/J.24 Zeolith-Gruppe; Blätterzeolithe

Cowlesit Ca(Si3Al2)O10·5-6H2O orthorhombisch VIII/J.24-010

VIII/J.25 Zeolith-Gruppe; Blätterzeolithe

Amicit K2Na2Al4Si4O16·5H2O monoklin I2 2 VIII/J.25-010
Gismondin Ca2(Si4Al4)O16·8H2O monoklin P21/c 2/m VIII/J.25-020
Gobbinsit Na5(Si11Al5)O32·11H2O orthorhombisch Pmnb mmm VIII/J.25-030
Garronit-Ca NaCa2.5(Si10Al6)O32·13H2O tetragonal I4m2, I41/a 42m, 4/m VIII/J.25-040
Phillipsit-Na (Na,K,Ca)2(Si,Al)8O16·6H2O monoklin P21/m 2/m VIII/J.25-050
Phillipsit-K (K,Na,Ca)2(Si,Al)8O16·6H2O monoklin P21/m 2/m VIII/J.25-055
Phillipsit-Ca (Ca,K,Na)2(Si,Al)8O16·6H2O monoklin P21/m 2/m VIII/J.25-060
Flörkeit NaK3Ca2(Si8Al8)O32·12H2O triklin P1 1 VIII/J.25-065
Harmotom Ba2(Na,K,Ca0,5)(Si11Al5)O32·12H2O monoklin P21/m 2/m VIII/J.25-070
Montesommait (K,Na)9(Si23Al9)O64·10H2O orthorhombisch Fdd2 mm2 VIII/J.25-075
Merlinoit K6Ca2[Al10Si22O64]·20H2O orthorhombisch Immm mmm VIII/J.25-080
Yugawaralith CaAl2Si6O16·4H2O monoklin Pc m VIII/J.25-090

VIII/J.26 Zeolith-Gruppe; Würfelzeolithe

Willhendersonit KCa(Si3Al3)O12·5H2O triklin P1 1 VIII/J.26-010
Chabasit-Na (Na,K,Ca)2(Si,Al)6O12·6H2O trigonal R3m 3m VIII/J.26-020
Chabasit-K (K2NaCa0.5)[Al4Si8O24]·11H2O trigonal R3m 3m VIII/J.26-025
Chabasit-Mg (Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24]·10H2O trigonal R3m 3 VIII/J.26-028
Chabasit-Ca Ca(Si4Al2)O12·6H2O trigonal R3m 3m VIII/J.26-030
Chabasit-Sr Sr(Si4Al2)O12·6H2O trigonal R3m 3m VIII/J.26-035
Tschernichit Ca(Si6Al2)O16·8H2O tetragonal P4/mmm 4/mmm VIII/J.26-040
Gmelinit-Na Na4(Si8Al4)O24·11H2O hexagonal P63/mmc 6/mmm VIII/J.26-050
Gmelinit-K (K,Na,Ca)5(Si,Al)24O48·22H2O hexagonal P63/mmc 6/mmm VIII/J.26-052
Gmelinit-Ca (Ca,Sr,Na)4(Si,Al)12O24·11H2O hexagonal P63/mmc 6/mmm VIII/J.26-054
Lévyn-Na (Na,Ca)5(Si,Al)18O36·18H2O trigonal R3m 3m VIII/J.26-058
Lévyn-Ca (Ca,Na)6(Si,Al)18O36·18H2O trigonal R3m 3m VIII/J.26-060
Offretit (K,Ca,Mg)3(Si,Al)18O36·15H2O hexagonal P6m2 6m2 VIII/J.26-070
Mazzit-Mg (Mg,K,Ca)6(Si26Al10)O72·30H2O hexagonal P63/mmc 6/mmm VIII/J.26-080
Mazzit-Na Na8(Si28Al8)O72·30H2O hexagonal P63/mmc 6/mmm VIII/J.26-085
Erionit-Na (Na,K,Ca)8(Si,Al)36O72·28H2O hexagonal P63/mmc 6/mmm VIII/J.26-090
Erionit-K (K,Na,Ca)6.7(Si,Al)36O72·28H2O hexagonal P63/mmc 6/mmm VIII/J.26-092
Erionit-Ca (Ca,K,Na)5.6(Si,Al)36O72·28H2O hexagonal P63/mmc 6/mmm VIII/J.26-094
Bellbergit (K,Ba,Sr)2Sr2Ca2(Ca,Na)4(Si,Al)36O72·30H2O hexagonal P63mc, P62c, P63/mmc 6mm, 6m2, 6/mmm VIII/J.26-095
Perlialith K9Na(Ca,Sr)(Si24Al12)O72·15H2O hexagonal P6/mmm 6/mmm VIII/J.26-100

VIII/J.27 Zeolith-Gruppe; Würfelzeolithe

Analcim Na(Si2Al)O6·H2O orthorhombisch Ibca mmm VIII/J.27-010
Pollucit (Cs,Na)(Si2Al)O6·nH2O kubisch Ia3d m3m VIII/J.27-020
Kirchhoffit CsBSi2O6 tetragonal I41/acd 4/mmm VIII/J.27-025
Wairakit CaAl2Si4O12·2H2O monoklin I2/a 2/m VIII/J.27-030
Faujasit-Na (Na,Ca,Mg)5(Si,Al)12O24·15H2O kubisch Fd3m m3m VIII/J.27-040
Faujasit-Mg (Mg,Na,K,Ca)5(Si,Al)12O24·15H2O kubisch Fd3m m3m VIII/J.27-044
Faujasit-Ca (Ca,Na,Mg)5(Si,Al)12O24·15H2O kubisch Fd3m m3m VIII/J.27-046
Paulingit-Na (Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O kubisch VIII/J.27-048
Paulingit-K (K,Ca,Na,Ba,☐)10(Si,Al)42O84·34H2O kubisch Im3m m3m VIII/J.27-050
Paulingit-Ca (Ca,K,Na,Ba,☐)10(Si,Al)42O84·34H2O kubisch Im3m m3m VIII/J.27-054


Literatur / Quellangabe

Weiß, Stefan - Das Große Lapis-Mineralienverzeichnis



Mineralsystematik-Übersicht