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Gajardoite

Pictures (1 Images total)

Gajardoit mit Chongit
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1586186568
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Gajardoit mit Chongit
Bällchen aus feinsten Tafeln von Gajardoit mit farblosen Nadeln von Chongit, Torrecillas Mine, Salar Grande, Iquique Provinz, Tarapacá Region, Chile; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Chile/Tarapacá, Region (I. Region)/Iquique, Provinz/Salar Grande/Mina Torrecillas
Mineral: Chongite, Gajardoite
Image: 1586186568
License: Usage for Mineralienatlas project only
Gajardoit mit Chongit

Bällchen aus feinsten Tafeln von Gajardoit mit farblosen Nadeln von Chongit, Torrecillas Mine, Salar Grande, Iquique Provinz, Tarapacá Region, Chile; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-04-06
Locality: Mina Torrecillas / Salar Grande / Iquique, Provinz / Tarapacá, Region (I. Region) / Chile

Collectors Summary

Color transparent
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 1.5
Cleavages vollkommen {001}
Fracture unregelmäßig
Solubility sehr, sehr langsam in H2O und langsam in verdünnter HCl bei Raumtemperatur
Crystal System hexagonal, P6/mmm

Chemism

Chemical formula

KCa0.5As3+4O6Cl2·5H2O

Empirical formula (analysis)

(K0.77Ca0.71Na0.05Mg0.05)Σ1.58As4O11Cl1.96H9.62

Chemical composition

Arsen, Calcium, Chlor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 615.79096435 u; Number of atoms in the formula: 28.16

Info

Empirical formula:

(K0.77Ca0.71Na0.05Mg0.05)As4O11Cl1.96H9.62

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.57

9.62

34.16

1.0079470

9.6964501
Oxygen

O

28.58

11

39.06

15.9994300

175.9937300
Sodium

Na

0.19

0.05

0.18

22.9897702

1.1494885
Magnesium

Mg

0.20

0.05

0.18

24.3050600

1.2152530
Chlorine

Cl

11.28

1.96

6.96

35.4532000

69.4882720
Potassium

K

4.89

0.77

2.73

39.0983100

30.1056987
Calcium

Ca

4.62

0.71

2.52

40.0784000

28.4556640
Arsenic

As

48.67

4

14.20

74.9216020

299.6864080

Strunz 9th edition incl. updates

4.J.

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
J: Antimonite, Bismuthite, Sulfite, Selenite, Tellurite

Lapis Classification

IV/J.09-008

IV: OXIDE
J: Arsenite (mit As3+)
9: Arsenite mit Ringstruktur [As4O8] 4-

IMA status

anerkannt - CNMNC Newsletter No. 26, August 2015, page 947

Mineral status

anerkanntes Mineral

Optical Properties

Color

transparent

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

RI value α / ω / n

ω = 1.780(3)

RI value γ / ε

ε = 1.570(5)

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

191

Space Group

P6/mmm

Cell parameters a (Å)

5.2558(8)

Cell parameters b (Å)

-

Cell parameters c (Å)

15.967(2)

Cell parameters a/b or c/a

3.038

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volume (ų)

381.972

Crystal structure

Neuer Strukturtyp; Struktur bestimmt

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

1.5

Density (g/cm³)

2.64 (gemessen) 2.676 (berechnet)

2.677 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Fracture

unregelmäßig

Tenacity

spröde

Instability

sehr, sehr langsam in H2O und langsam in verdünnter HCl bei Raumtemperatur

(Co-)Type locality

(Co-)Type locality

Chile/Tarapacá, Region (I. Region)/Iquique, Provinz/Salar Grande/Mina Torrecillas

Type material

Co-Typ-Material ist gelagert in der Mineralogischen Sammlung des Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA

Collection number of type material

65585, 65586 und 65587

Preface

Author (Name, Year)

Anthony R. Kampf, Barbara Nash, Maurizio Dini und Arturo A. Molina Donoso (2015)

References

Kampf, A.R., Nash, B., Dini, M. and Molina Donoso, A.A. (2015) Gajardoite, IMA 2015-040. CNMNC Newsletter No. 26, August 2015, page 947; Mineralogical Magazine, 79, 941 - 947.

Kampf, Anthony R.; Nash, Barbara; Dini, Maurizio; Molina Donoso, Arturo A. - Gajardoite, KCa0.5As3+4O6Cl2·5H2O, a new mineral related to lucabindiite and torrecillasite from the Torrecillas mine, Iquique Province, Chile - Mineralogical Magazine [PREPUBLICATION 19 Feb. 2016]

Other languages

German

Gajardoit

English

Gajardoite

Russian

Гайардоит

CNMNC (IMA)-Number

IMA 2015-040

CNMNC symbol

Symbol

Gaj

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 1LBhHAT69ECR0kn74_E7ow
GUID (Global unique identifier) 1C61B0D4-FA04-40F4-91D2-49FBE3F13BA3
Database ID 7988