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Mcallisterite

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Mcallisterit
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Mcallisterit
Weiße Mcallisterit-Aggregate zusammen mit Gips und Halit (ohne Maßstab) von der Typlokalität Eagle Borax Spring, Death Valley, California, USA.
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: USA/Kalifornien (California)/Inyo Co./Death Valley National Park/Death Valley/Eagle Borax Spring
Mineral: Mcallisterite
Image: 1704228096
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Mcallisterit

Weiße Mcallisterit-Aggregate zusammen mit Gips und Halit (ohne Maßstab) von der Typlokalität Eagle Borax Spring, Death Valley, California, USA.
Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2024-01-02
Locality: Eagle Borax Spring / Death Valley / Death Valley National Park / Inyo Co. / Kalifornien (California) / USA

Collectors Summary

Color farblos, gelbbraun, weiß
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ Säuren, + H2O
Crystal System trigonal, R3c

Chemism

Chemical formula

Mg2B12O14(OH)12·9H2O

Chemical composition

Magnesium, Bor, Sauerstoff, Wasserstoff

Unit weight: 768.56898 u; Number of atoms in the formula: 79

Info

Empirical formula:

Mg2B12O14(OH)12·9H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

3.93

30

37.97

1.0079470

30.2384100
Boron

B

16.88

12

15.19

10.8117000

129.7404000
Oxygen

O

72.86

35

44.30

15.9994300

559.9800500
Magnesium

Mg

6.32

2

2.53

24.3050600

48.6101200

Analysis wt%

B2O3 : 53.60, MgO : 10.40, H2O : 35.66 (Ref: American Mineralogist 67)

Strunz 9th edition incl. updates

6.FA.10

6: Borate
F: Hexaborate
A: Insel(Neso)-Hexaborate
10:Mcallisterit-Gruppe

Lapis Classification

V/H.17-020

V: NITRATE, CARBONATE UND BORATE
H: Gruppenborate
17: Planare und tetraedrische Gruppen [B3O5] 1- bis [B6O10] 2-

Classification by Hölzel

6.FA.120

6: Borates
F: Hexaborates
A: Nesohexaborates
1: Aksaite-Group - 6(3P+3T)

Dana 8th edition

26.06.02.01

26: Hydrated Borates Containing Hydroxyl or Halogen
06: Hydrated Borates Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, gelbbraun, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.041
Birefringence chart\! Mcallisterite title=Birefringence chart Mcallisterite

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

1.507

RI value γ / ε

1.464

Ri mean

1.493

2V angle

Uniaxial (-)

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich weiß

LW-UV Intensity

schwach

Color SW-UV (254nm)

  

gelblich weiß

SW-UV Intensity

schwach

Color SW-UV Afterglow (254nm)

  

gelblich weiß

SW-UV Afterglow Intensity

schwach

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

167

Space Group

R3c

Cell parameters a (Å)

11.543

Cell parameters b (Å)

-

Cell parameters c (Å)

35.556

Cell parameters a/b or c/a

3.080

Cell parameters c/b

-

Z

6

Volume (ų)

4102.805

X-Ray Powder Diffraction

8.715(100),
6.645(30),
5.772(50),
4.359(40),
4.063(50),
3.351(50),
3.261(50),
2.805(50)
XRD chart Mcallisterite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

1.867

1.866 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren, + H2O

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)/Inyo Co./Death Valley National Park/Furnace Creek District/Twenty Mule Team Canyon/Mott Colemanit Prospect

Preface

Author (Name, Year)

Schaller & Vlisidis & Mrose, 1965

References

American Mineralogist 50 (1965), 629

Other languages

German

Mcallisterit

Spanish

Mcallisterita

English

Mcallisterite

French

Mcallisterite

Russian

Макэлистерит

Alternative Name

German

Macallisterit

Hugo Strunz: Mineralogische Tabellen (8. Auflage)

CNMNC (IMA)-Number

IMA 1963-012

CNMNC symbol

Symbol

Mcl

Locations with GPS information

IDs

GUSID (Global unique identifier short form) LO0YXTJ4o0WPKnCR_GHX6w
GUID (Global unique identifier) 5D18ED2C-7832-45A3-8F2A-7091FC61D7EB
Database ID 2429