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Medaite

Pictures (10 Images total)

Medait
Views (File:
1167315883
): 1194
Medait
Bildbreite: 5 mm; Fundort: Mine Molinello, Valle Graveglia, Genua, Italien
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Medaite
Image: 1167315883
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Medait

Bildbreite: 5 mm; Fundort: Mine Molinello, Valle Graveglia, Genua, Italien
Copyright: Stephan Wolfsried
Contribution: Hg 2006-12-28
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien
Medait
Views (File:
1271607696
): 695
Medait
Bildbreite: 2 mm, Fundort: Miniera Valgraveglia (Miniera Gambatesa), Reppia, Val Graveglia, Ne, Genova, Ligurien (Liguria), Italien.
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Reppia/Miniera Valgraveglia (Gambatesa)
Mineral: Medaite
Image: 1271607696
Rating: 4 (votes: 1)
License: Usage for Mineralienatlas project only
Medait

Bildbreite: 2 mm, Fundort: Miniera Valgraveglia (Miniera Gambatesa), Reppia, Val Graveglia, Ne, Genova, Ligurien (Liguria), Italien.
Copyright: Luigi Chiappino
Contribution: thdun5 2010-04-18
Locality: Miniera Valgraveglia (Gambatesa) / Reppia / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien
Medait xx
Views (File:
1162131321
): 780
Medait xx
Fundort: Mine Molinello, Valle Graveglia, Genua, Ligurien, Italien; Bildbreite: 6 mm
Copyright: loismin; Contribution: loismin
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Medaite
Image: 1162131321
License: Usage for Mineralienatlas project only
Medait xx

Fundort: Mine Molinello, Valle Graveglia, Genua, Ligurien, Italien; Bildbreite: 6 mm
Copyright: loismin
Contribution: loismin 2006-10-29
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien
Medait
Views (File:
1285411270
): 652
Medait
Bildbreite: 10 mm, Fundort: Grube Molinello, Genova, Ligurien, Italien
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Medaite
Image: 1285411270
License: Usage for Mineralienatlas project only
Medait

Bildbreite: 10 mm, Fundort: Grube Molinello, Genova, Ligurien, Italien
Copyright: Luigi Chiappino
Contribution: thdun5 2010-09-25
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien
Medait
Views (File:
1472153295
): 428
Medait
Tafelige rote Kristalle, Bb = 2,3 mm; Fundort:Molinello Mine, Val Gravelglia, Chiavari, Genua, Italien.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A001039, Donator: Karoline Meyer
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Medaite
Image: 1472153295
License: Usage for Mineralienatlas project only
Medait (SNr: A001039)

Tafelige rote Kristalle, Bb = 2,3 mm; Fundort:Molinello Mine, Val Gravelglia, Chiavari, Genua, Italien.
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2016-08-25
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien
Medait
Views (File:
1498046594
): 188
Medait
Molinello Mine Lugurien Italien; Bildbreite 2,3 mm
Copyright: Ulrich Hansper; Contribution: Ulrich Hansper
Collection: Ulrich Hansper
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello
Mineral: Medaite
Image: 1498046594
License: Usage for Mineralienatlas project only
Medait

Molinello Mine Lugurien Italien; Bildbreite 2,3 mm
Collection: Ulrich Hansper
Copyright: Ulrich Hansper
Contribution: Ulrich Hansper 2017-06-21
Locality: Miniera di Molinello / Val Graveglia / Ne / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien

You find additional Medaite specimen at the Geolitho Museum

Collectors Summary

Color bräunlich rot
Streak color gelb weiß
Solubility - HCl, HNO3, H2O
Crystal System monoklin, P21/n

Chemism

Chemical formula

(Mn,Ca)6(V5+,As)Si5O18(OH)

Chemical composition

Arsen, Calcium, Mangan, Silicium, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 809.70012455 u; Number of atoms in the formula: 32

Info

Empirical formula:

(Mn0.75Ca0.25)6(V0.75As0.25)Si5O18(OH)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.12

1

3.13

1.0079470

1.0079470
Oxygen

O

37.54

19

59.38

15.9994300

303.9891700
Silicon

Si

17.34

5

15.63

28.0855300

140.4276500
Calcium

Ca

7.42

1.5

4.69

40.0784000

60.1176000
Vanadium

V

4.72

0.75

2.34

50.9415100

38.2061325
Manganese

Mn

30.53

4.5

14.06

54.9380499

247.2212246
Arsenic

As

2.31

0.25

0.78

74.9216020

18.7304005

Analysis wt%

Ø SiO2 : 38.09, MnO : 49.94, CaO : 1.30, As2O5 : 2.11, V2O5 : 7.44, H2O : 1.09 (Ref: American Mineralogist 82)

Strunz 9th edition incl. updates

9.BJ.30

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
J: Gruppen(Soro)-Silikate mit Si3O10, Si4O11, etc. Anionen; Kationen in oktahedraler [6] und/oder größerer Koordination
30:Medait-Gruppe

Lapis Classification

VIII/C.34-040

VIII: SILIKATE
C: Gruppensilikate
34: Sonstige Gruppensilikate

Classification by Hölzel

9.BQ.370

9: SILICATES
B: Sorosilicates
Q: Si3O10 + SiO4-Group

Dana 8th edition

57.04.01.01

57: Sorosilicates Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
04: Sorosilicates Sorosilicate Insular Si3O10 and Larger Noncyclic Groups with groups with 6 or more tetrahedra

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

bräunlich rot

Streak color

gelb weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.03
Birefringence chart\! Medaite title=Birefringence chart Medaite

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

1.77

RI value β

1.78

RI value γ / ε

1.80

Ri mean

1.783

2V angle

Biaxial (+) 71°c

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

6.712

Cell parameters b (Å)

28.948

Cell parameters c (Å)

7.578

Cell parameters a/b or c/a

0.232

Cell parameters c/b

0.262

Cell parameters α

90°

Cell parameters β

95.40

Cell parameters γ

90°

Z

4

Volumne (ų)

1465.863

X-Ray Powder Diffraction

3.259(100),
3.159(80),
3.097(70),
3.009(50),
2.941(70),
2.785(50),
2.613(70),
2.192(40)
XRD chart Medaite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.7

3.669 ( ρ calc. Mineralienatlas )

Instability

- HCl, HNO3, H2O

(Co-)Type locality

(Co-)Type locality

Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Ne/Val Graveglia/Miniera di Molinello

Preface

Author (Name, Year)

Gramaccioli & Griffin & Mottana, 1982

References

American Mineralogist 67 (1982), 85

Other languages

German

Medait

French

Medaite

English

Medaite

Spanish

Medaíta

Russian

Медаит

CNMNC (IMA)-Number

IMA 1979-062

CNMNC symbol

Symbol

Med

Locations with GPS information