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Mcallisterite Mineral Data

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General Mcallisterite Information

Help on Chemical  Formula: Chemical Formula: Mg2B12O14(OH)12•9(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg2B12O14(OH)12•9(H2O)
Help on Environment: Environment: Secondary mineral derived from colemanite and priceite veins in altered basalt.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Mott open cut, head of 20 Mule Team Canyon, Death Valley, Inyo Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for James Franklin McAllister (1911-2000), geologist, U.S. Geological Survey, Menlo Park, California, USA, who collected the originally described material.
Help on Name Pronunciation: Name Pronunciation: Mcallisterite + Pronunciation Say MCALLISTERITE
Help on Synonym: Synonym: ICSD 4423
  PDF 18-767

Mcallisterite Image

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

Mcallisterite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.0803
Help on Cell Dimensions: Cell Dimensions: a = 11.543, c = 35.556, Z = 6; V = 4,102.81 Den(Calc)= 1.87
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.715(1), 4.063(0.5), 5.772(0.5),

Physical Properties of Mcallisterite

Help on Cleavage: Cleavage: {0001} Good, {0112} Good
Help on Color: Color: Colorless, Yellow brown, White.
Help on Density: Density: 1.867
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Mcallisterite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.459, w=1.504, bire=0.0450.

Calculated Properties of Mcallisterite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.92 gm/cc
note: Specific Gravity of Mcallisterite =1.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEMcallisterite = 0.45 barns/electron
U=PEMcallisterite x rElectron Density= 0.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mcallisterite is Not Radioactive

Mcallisterite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.06)Dana Type
  (26.06.02)Dana Group Mcallisterite Mg2B12O14(OH)12•9(H2O) R 3c 3 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 06.FA.10





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