Mcallisterite Mineral Data

Mcallisterite Mineral Data +

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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)

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.

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Mcallisterite

Electron Density:

r_electron=1.92 gm/cc
note: r_{Mcallisterite}=1.87 gm/cc.

Fermion Index

Fermion Index = 0.04026
Boson Index = 0.95974

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mcallisterite is Not Radioactive

Mcallisterite Classification

Dana Class:

26.6.2.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.6)Dana Type

(26.6.2)Dana Group

26.6.2.1 Mcallisterite Mg2B12O14(OH)12·9(H2O) R 3c 3 2/m

Strunz Class:

V/H.17-20 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.17 - Admontite - Rivadavite series

V/H.17-10 Admontite MgB6O10·7(H2O) P 2₁/c 2/m

V/H.17-20 Mcallisterite Mg2B12O14(OH)12·9(H2O) R 3c 3 2/m

V/H.17-30 Aksaite MgB6O7(OH)6·2(H2O) P bca 2/m 2/m 2/m

V/H.17-40 Rivadavite Na6MgB24O40·22(H2O) P 2₁/c 2/m

Other Mcallisterite Information

References:

NAME( MinRec) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Mcallisterite

Mg2B12O14(OH)12·9(H2O)
Dana No: 26.6.2.1 Strunz No: V/H.17-20
Locality:

Notes: