Mcallisterite Mineral Data

General Mcallisterite Information

Chemical Formula:

Mg2B12O14(OH)12•9(H2O)

Composition:

Molecular Weight = 768.55 gm

Magnesium 6.32 % Mg 10.49 % MgO

Boron 16.88 % B 54.35 % B₂O₃

Hydrogen 3.93 % H 35.16 % H₂O

Oxygen 72.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂B₁₂O₁₄(OH)₁₂•9(H₂O)

Environment:

Secondary mineral derived from colemanite and priceite veins in altered basalt.

IMA Status:

Approved IMA 1965

Locality:

Mott open cut, head of 20 Mule Team Canyon, Death Valley, Inyo Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for James Franklin McAllister (1911-2000), geologist, U.S. Geological Survey, Menlo Park, California, USA, who collected the originally described material.

Name Pronunciation:

Mcallisterite + Pronunciation

Synonym:

ICSD 4423

PDF 18-767

Mcallisterite Image

Images:

Mcallisterite

Comments: Tan to white opaque porous aggregate of mcallisterite.
Location: Qinghai, China. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mcallisterite Crystallography

Axial Ratios:

a:c = 1:3.0803

Cell Dimensions:

a = 11.543, c = 35.556, Z = 6; V = 4,102.81 Den(Calc)= 1.87

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.715(1), 4.063(0.5), 5.772(0.5),

Physical Properties of Mcallisterite

Cleavage:

{0001} Good, {0112} Good

Color:

Colorless, Yellow brown, White.

Density:

1.867

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Mcallisterite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2575,KPDmeas= 0.2579,KC= 0.2574
Ncalc = 1.48

Optical Data:

Uniaxial (-), e=1.459, w=1.504, bire=0.0450.

Calculated Properties of Mcallisterite

Electron Density:

Bulk Density (Electron Density)=1.92 gm/cc
note: Specific Gravity of Mcallisterite =1.87 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Mcallisterite}= 0.45 barns/electron
U=PE_{Mcallisterite} x rElectron Density= 0.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mcallisterite is Not Radioactive

Mcallisterite Classification

Dana Class:

26.06.02.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.06)Dana Type

(26.06.02)Dana Group

26.06.02.01 Mcallisterite Mg2B12O14(OH)12•9(H2O) R 3c 3 2/m

Strunz Class:

06.FA.10 06 - BORATES

06.F - Hexaborates

06.FA -Neso-hexaborates

06.FA.10 Mcallisterite Mg2B12O14(OH)12•9(H2O) R 3c 3 2/m

Other Mcallisterite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mcallisterite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Mcallisterite here :
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Print or Cut-and-Paste your Mcallisterite Specimen Label here :

Mcallisterite

Mg2B12O14(OH)12•9(H2O)
Dana No: 26.06.02.01 Strunz No: 06.FA.10
Locality:

Notes: