Preobrazhenskite Mineral Data

Preobrazhenskite Mineral Data +

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General Preobrazhenskite Information

Chemical Formula:

Mg3B11O15(OH)9

Composition:

Molecular Weight = 584.88 gm

Magnesium 12.47 % Mg 20.67 % MgO

Boron 20.33 % B 65.47 % B₂O₃

Hydrogen 1.55 % H 13.86 % H₂O

Oxygen 65.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃B₁₁O₁₅(OH)₉

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 79143

PDF 31-788

Preobrazhenskite Image

Images:

Preobrazhenskite

Comments: Crudely formed white to tan translucent preobrazhenskite crystal on yellow crystalline massive material.
Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Preobrazhenskite Crystallography

Axial Ratios:

a:b:c =1.7833:1:1.1105

Cell Dimensions:

a = 16.3, b = 9.14, c = 10.15, Z = 4; V = 1,512.17 Den(Calc)= 2.57

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn

Crystal Structure:

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Burns P C , Hawthorne F C , The Canadian Mineralogist , 32 (1994) p.387-396, Structure and hydrogen bonding in preobrazhenskite, a complex heteropolyhedral, borate

Physical Properties of Preobrazhenskite

Color:

Colorless, Yellow, Dark gray.

Density:

2.45

Diaphaniety:

Transparent to Translucent

Hardness:

4.5-5 - Near Apatite

Streak:

white

Optical Properties of Preobrazhenskite

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2262,KPDmeas= 0.2373,KC= 0.2292

Optical Data:

Biaxial (+), a=1.573-1.576, b=1.573-1.576, g=1.594-1.596, bire=0.0200-0.0210

Calculated Properties of Preobrazhenskite

Electron Density:

r_electron=2.57 gm/cc
note: r_{Preobrazhenskite}=2.57 gm/cc.

Fermion Index

Fermion Index = 0.05324
Boson Index = 0.94676

Photoelectric:

PE_{Preobrazhenskite}= 0.55 barns/electron
U=PE_{Preobrazhenskite} x r_electron= 1.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Preobrazhenskite is Not Radioactive

Preobrazhenskite Classification

Dana Class:

25.7.1.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.7)Dana Type

(25.7.1)Dana Group

25.7.1.1 Preobrazhenskite Mg3B11O15(OH)9 P bcn 2/m 2/m 2/m

Strunz Class:

V/K.08-10 V - Nitrates, Carbonates and Borates

V/K - Layered borates with complex groups [Bx(O,OH)y]

V/K.08 - Preobrazhenskite

V/K.08-05 Studenitsite NaCa2[B9O14(OH)4]·2(H2O) P 2₁/c 2/m

V/K.08-10 Preobrazhenskite Mg3B11O15(OH)9 P bcn 2/m 2/m 2/m

V/K.08-20 Vitimite! Ca6B14O19(SO4)(OH)14·5(H2O) P 2/m, P 2, Pm, pseudo-hex Mono

Other Preobrazhenskite Information

References:

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

See Also:

Links to other databases for Preobrazhenskite :
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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Preobrazhenskite

Mg3B11O15(OH)9
Dana No: 25.7.1.1 Strunz No: V/K.08-10
Locality:

Notes: