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Alarsite (Alarsit)

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Alarsit
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Alarsit
farbloses Aggregat von Alarsit, zweiter Schlackenkegel der Großen Spalteneruption, Tolbachik, Kamtschatka, Russland; BB < 1 mm, analysiert mittels REM-EDX
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Ferner Osten, Föderationskreis/Kamtschatka, Krai/Milkowski (Milkovsky), Rajon/Tolbachik-Vulkan-Feld/Große Spalteneruption (Great Fissure)/Nördlicher Bruch/Zweiter Schlackenkegel
Mineral: Alarsite
Image: 1580155900
License: Usage for Mineralienatlas project only
Alarsit  E
Analysed with energy dispersive X-ray spectroscopy EDX

farbloses Aggregat von Alarsit, zweiter Schlackenkegel der Großen Spalteneruption, Tolbachik, Kamtschatka, Russland; BB < 1 mm, analysiert mittels REM-EDX
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-01-27
Locality: Zweiter Schlackenkegel / Nördlicher Bruch / Große Spalteneruption (Great Fissure) / Tolbachik-Vulkan-Feld / Milkowski (Milkovsky), Rajon / Kamtschatka, Krai / Ferner Osten, Föderationskreis / Russland

Collectors Summary

Color farblos, cremeweiß
Streak color weiß
Hardness (Mohs) 5.5
Cleavages fehlt
Fracture muschelig
Solubility +++ verdünnte Säuren
Crystal System trigonal, P3121, P3221

Chemism

Chemical formula

Al[AsO4]

Chemical composition

Aluminium, Arsen, Sauerstoff

Unit weight: 165.9008602 u; Number of atoms in the formula: 6

Info

Empirical formula:

Al[AsO4]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

38.58

4

66.67

15.9994300

63.9977200
Aluminium

Al

16.26

1

16.67

26.9815382

26.9815382
Arsenic

As

45.16

1

16.67

74.9216020

74.9216020

Analysis wt%

Al2O3 : 31.98, Fe2O3 : 0.60, CuO : 0.54, As2O5 : 66.71 (Ref: Doklady Akademiia Nauk, SSSR 94)

Strunz 9th edition incl. updates

8.AA.05

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
A: Mit kleinen [Kationen] (einige zusätzlich mit größeren [Kationen])
05:Berlinit-Gruppe

Lapis Classification

VII/A.01-012

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
1: Kleine Kationen: Li-Be-Al-Fe 3+

Classification by Hölzel

8.AA.110

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
A: Phosphates, C small

Dana 8th edition

38.04.02.02

38: Anhydrous Phosphates, etc
04: Anhydrous Phosphates, etc A+ XO4
02: Berlinite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, cremeweiß

Streak color

weiß

max. Birefringence

0.012
Birefringence chart\! Alarsite title=Birefringence chart Alarsite

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

1.596

RI value γ / ε

1.608

Ri mean

1.600

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

32, 32

Space Group number

152, 154

Space Group

P3121, P3221

Cell parameters a (Å)

5.031

Cell parameters b (Å)

-

Cell parameters c (Å)

11.226

Cell parameters a/b or c/a

2.231

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

3

Volume (ų)

246.073

X-Ray Powder Diffraction

4.36(20),
4.06(30),
3.442(100),
2.514(10),
2.359(10),
2.294(10),
1.873(20),
1.420(10)
XRD chart Alarsite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

440 (20g)

Density (g/cm³)

3.32 (gemessen)

3.358 ( ρ calc. Mineralienatlas )

Cleavages

fehlt

Fracture

muschelig

Tenacity

spröde

Instability

+++ verdünnte Säuren

(Co-)Type locality

(Co-)Type locality

Russland/Ferner Osten, Föderationskreis/Kamtschatka, Krai/Milkowski (Milkovsky), Rajon/Tolbachik-Vulkan-Feld/Große Spalteneruption (Great Fissure)

Preface

Author (Name, Year)

Semenova & Vergasova & Filatov & Anan'ev, 1994

References

Doklady Akademiia Nauk (in Russian) 338 (1994), 501

Other languages

German

Alarsit

Spanish

Alarsita

English

Alarsite

French

Alarsite

Russian

Аларсит

CNMNC (IMA)-Number

IMA 1993-003

CNMNC symbol

Symbol

Ars

Locations with GPS information

IDs

GUSID (Global unique identifier short form) F5z4uVvODU6ofBmQ476ZZA
GUID (Global unique identifier) B9F89C17-CE5B-4E0D-A87C-1990E3BE9964
Database ID 49