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Demartinite (IMA 2006-034)

Collectors Summary

Color farblos
Solubility + H2O
Crystal System hexagonal, P63mc
Morphology Das Mineral bildet einfache, scharfkantige, hexagonal-pyramidale Kristalle bis zu 0,3mm Größe, mit einer Tracht aus der Pyramide {112} und dem Pedion {001}.

Chemism

Chem­ical formula

K2[SiF6]

Addi­tional chem. informa­tion

Polymorph mit Hieratit

Chem­ical com­po­si­tion

Silicium, Fluor, Kalium

Unit weight: 220.2725695 u; Number of atoms in the formula: 9

Info

Empirical formula:

K2[SiF6]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Fluorine

F

51.75

6

66.67

18.9984033

113.9904195

Silicon

Si

12.75

1

11.11

28.0855300

28.0855300

Potassium

K

35.50

2

22.22

39.0983100

78.1966200

Strunz 9th edi­tion incl. updates

3.CH.15

3: Halide (Fluoride, Chloride, Bromide, Iodide)
C: Komplexe Halogenide
H: Silicofluoride
15:Hieratit-Gruppe

Lapis Clas­sifica­tion

III/B.02-025

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
B: Doppelhalogenide
2: mit [BF4] 1-, [SiF6] 2- und [AlF6] 3-

Clas­sifica­tion by Hölzel

3.DC.220

3: HALIDES
D: Complex Halides
C: Boro und Silico-Fluorides
2: Silico-Fluoride-Group

IMA sta­tus

anerkannt 2006

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos

max. Birefrin­gence

0.010

Birefringence chart\! Demartinite title=Birefringence chart Demartinite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.350

RI value γ / ε

1.340

Ri mean

1.347

2V angle

Uniaxial (-)

Pleochro­ism

kein

Crystallography

Crystal Sys­tem

hexagonal

Class (H-M)

6mm

Space Group number

186

Space Group

P63mc

Cell param­e­ters a (Å)

5.646

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

9.232

Cell param­e­ters a/b or c/a

1.635

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

120°

Z

2

Volumne (ų)

254.864

X-Ray Pow­der Diffrac­tion

4.90(25), 4.62(75), 4.32(43), 2.358(22), 2.301(100), 2.155(54), 1.909(14), 1.403(13)

XRD chart Demartinite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphol­ogy

Das Mineral bildet einfache, scharfkantige, hexagonal-pyramidale Kristalle bis zu 0,3mm Größe, mit einer Tracht aus der Pyramide {112} und dem Pedion {001}.

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.85 gemessen

2.87 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+ H2O

Chem­ical Prop­er­ties and Tests

nicht hygroskopisch

Preface

Name from

Francesco Demartin (Professor für Chemie, Universität Mailand)

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: H301: Giftig bei Verschlucken., H311: Giftig bei Hautkontakt., H331: Giftig bei Einatmen., P260: Staub / Rauch / Gas / Nebel / Dampf / Aerosol nicht einatmen., P301+P310: Bei Verschlucken: Sofort Giftinformationszentrum, Arzt oder … anrufen., P320: Besondere Behandlung dringend erforderlich (siehe … auf diesem Kennzeichnungsetikett)., P361: Alle kontaminierten Kleidungsstücke sofort ausziehen., P405: Unter Verschluss aufbewahren., P501: Inhalt / Behälter … zuführen.

References

Mineralien Welt 04/08, Steffen Jahn, Die neuen Mineralien 2007 - 2008

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Cryptohalite

(NH4)2SiF6

kubisch : m3m : Fm3m

3.CH.15

Demartinite

K2[SiF6]

hexagonal : 6mm : P63mc

3.CH.15

Hieratite

K2SiF6

kubisch : m3m : Fm3m

3.CH.15

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Malladrite

Na2SiF6

trigonal : 32 : P321

III/B.02-010

Hieratite

K2SiF6

kubisch : m3m : Fm3m

III/B.02-020

Demartinite

K2[SiF6]

hexagonal : 6mm : P63mc

III/B.02-025

Cryptohalite

(NH4)2SiF6

kubisch : m3m : Fm3m

III/B.02-030

Bararite

(NH4)2SiF6

trigonal : 3m : P3m1

III/B.02-040

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Malladrite

Na2SiF6

trigonal : 32 : P321

3.DC.200

Hieratite

K2SiF6

kubisch : m3m : Fm3m

3.DC.210

Demartinite

K2[SiF6]

hexagonal : 6mm : P63mc

3.DC.220

Cryptohalite

(NH4)2SiF6

kubisch : m3m : Fm3m

3.DC.230

Panichiite

(NH4)2SnCl6

kubisch : m3m : Fd3m

3.DC.235

Bararite

(NH4)2SiF6

trigonal : 3m : P3m1

3.DC.250

Other languages

German

Demartinit

English

Demartinite

Russian

Демартинит

IMA Number

IMA 2006-034

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Demartinit
Google-Bilder-Suche - search for: Demartinit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Demartinit

English pages

Mindat - search for: Demartinite
Webmineral - search for:Demartinite
Handbook-of-Mineralogy - search for: Demartinite
RRUFF - Raman, XRD and other mineral data - search for: Demartinite
RRUFF - References and PDF downloads - search for: Demartinite
American-Mineralogist-Crystal-Structure-Database - search for: Demartinite
Athena - search for: Demartinite

Russian pages

Webmineral.ru - search for: Демартинит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Demartinit
Crystal-Treasure.com - search for: Demartinit
Bosse - search for: Demartinit

Locations with GPS information




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