https://www.mineraliengrosshandel.com
https://weloveminerals.com/
https://www.mineral-bosse.de
https://www.mineralbox.biz
https://www.edelsteine-neuburg.de
'._('einklappen').'
 

Alpeite

Pictures (1 Images total)

Alpeit
Views (File:
1587234501
): 2097
Alpeit
braune Kristalle mit Spaltflächen von Alpeit, Monte Alpe Mine, Maissana, La Spezia Provinz, Ligurien, Italien; BB < 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Castiglione Chiavarese/Monte Alpe/Monte Alpe Mine
Mineral: Alpeite
Image: 1587234501
License: Usage for Mineralienatlas project only
Alpeit

braune Kristalle mit Spaltflächen von Alpeit, Monte Alpe Mine, Maissana, La Spezia Provinz, Ligurien, Italien; BB < 1 mm
Copyright: Joy Desor
Contribution: openpit 2020-04-18
Locality: Monte Alpe Mine / Monte Alpe / Castiglione Chiavarese / Genua (Genova), Metropolitanstadt / Ligurien (Liguria), Region / Italien

Collectors Summary

Color bräunlichrot
Streak color beige
Lustre Glasglanz, Seidenglanz
Hardness (Mohs) 5.5 - 6
Crystal System orthorhombisch, Pnmm

Chemism

Chemical formula

Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(VO4)(OH)6

Empirical formula (analysis)

(Ca3.84Mn2+0.16)Σ4.00 (Mn3+1.33Al0.67)Σ2.00 (Al1.29Mn3+0.60V5+0.10)Σ1.99 (Mn3+0.70Mg0.65Al0.42Co2+0.20)Σ1.97 (SiO4)2(Si3O10)[(V5+0.75Si0.25)O4](OH)6

Chemical composition

Aluminium, Calcium, Magnesium, Mangan, Silicium, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 1043.760243317 u; Number of atoms in the formula: 49.96

Info

Empirical formula:

(Ca3.84Mn0.16)(Mn1.33Al0.67)(Al1.29Mn0.60V0.10)(Mn0.70Mg0.65Al0.42Co0.20)(SiO4)2(Si3O10)[(V0.75Si0.25)O4](OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.58

6

12.01

1.0079470

6.0476820
Oxygen

O

42.92

28

56.04

15.9994300

447.9840400
Magnesium

Mg

1.51

0.65

1.30

24.3050600

15.7982890
Aluminium

Al

6.15

2.38

4.76

26.9815382

64.2160609
Silicon

Si

14.13

5.25

10.51

28.0855300

147.4490325
Calcium

Ca

14.74

3.84

7.69

40.0784000

153.9010560
Vanadium

V

4.15

0.85

1.70

50.9415100

43.3002835
Manganese

Mn

14.69

2.79

5.58

54.9380499

153.2771592
Cobalt

Co

1.13

0.2

0.40

58.9332009

11.7866402

Strunz 9th edition incl. updates

9.B.

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)

Lapis Classification

VIII/C.34-018

VIII: SILIKATE
C: Gruppensilikate
34: Sonstige Gruppensilikate

IMA status

anerkannt - CNMNC Newsletter November 2016

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Ardennite group

Optical Properties

Color

bräunlichrot

Streak color

beige

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz, Seidenglanz

max. Birefringence

0.061
Birefringence chart\! Alpeite title=Birefringence chart Alpeite

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

α = 1.747(3)

RI value β

β = 1.785(3)

RI value γ / ε

γ = 1.808(3)

Ri mean

1.778

2V angle

Biaxial(-) 73(2)° (gemessen)

Orientation

X = a, Y = b, Z = c

Dispersion

stark; r>v

Pleochroism

Y > Z > X in Schattierungen von rötlichbraun

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

59

Space Group

Pnmm

Cell parameters a (Å)

8.942(1)

Cell parameters b (Å)

6.0534(6)

Cell parameters c (Å)

18.978(2)

Cell parameters a/b or c/a

1.477

Cell parameters c/b

3.135

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

1027.27

Crystal structure

Ardennit-Gruppe; Struktur bestimmt

X-Ray Powder Diffraction

4.049(52),
3.259(51),
3.022(93),
2.673(100),
2.572(69),
2.095(53),
1.677(52),
1.511(83)
XRD chart Alpeite

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

Physical Properties

Hardness (Mohs)

5.5 - 6

Density (g/cm³)

3.374 (berechnet)

3.374 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Italien/Ligurien (Liguria), Region/Genua (Genova), Metropolitanstadt/Castiglione Chiavarese/Monte Alpe/Monte Alpe Mine

Type material

Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA

Collection number of type material

66288

Preface

Author (Name, Year)

Anthony R. Kampf, Cristina Carbone, Barbara P. Nash, Donato Belmonte, Luigi Chiappino und Fabrizio Castellaro (2016)

References

Kampf, A.R., Carbone, C., Nash, B.P., Belmonte, D., Chiappino, L. and Castellaro, F. (2016) Alpeite, IMA 2016-072. CNMNC Newsletter No. 34, December 2016, page 1318; Mineralogical Magazine, 80, 1315–1321.

IMA group assignments

Other languages

German

Alpeit

English

Alpeite

Russian

Альпеит

CNMNC (IMA)-Number

IMA 2016-072

CNMNC symbol

Symbol

Apt

Locations with GPS information

IDs

GUSID (Global unique identifier short form) -LRKX7l2NEaE3zU1oz1BFQ
GUID (Global unique identifier) 5F4AB4F8-76B9-4634-84DF-3535A33D4115
Database ID 8270