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 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 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
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

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