Preobrazhenskite Mineral Data

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

Environment:

Fne-grained haliteï¿½polyhalite rock.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Kazakhstan, in and under the Inder borate deposit. Link to MinDat.org Location Data.

Name Origin:

Named for Pavel Ivanovich Preobrazhenskii (1874-1944), investigator of Russian salt deposits, Institute of Halurgy, St. Petersburg.

Name Pronunciation:

Preobrazhenskite + Pronunciation

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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn

Physical Properties of Preobrazhenskite

Color:

Colorless, Yellow, Dark gray.

Density:

2.45

Diaphaneity:

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
Ncalc = 1.56 - 1.59

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:

Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Preobrazhenskite =2.57 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

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

Radioactivity:

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

Preobrazhenskite Classification

Dana Class:

25.07.01.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.07)Dana Type

(25.07.01)Dana Group

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

Strunz Class:

06.GB.15 06 - BORATES

06.G - Heptaborates and other Megaborates

06.GB -Phyllo-nonborates, etc.

06.GB.15 Preobrazhenskite Mg3B11O15(OH)9 P bcn 2/m 2/m 2/m

Other Preobrazhenskite 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 Preobrazhenskite :
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

Search for Preobrazhenskite using:

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

Visit our Advertisers for Preobrazhenskite :

Ask about Preobrazhenskite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Preobrazhenskite

Mg3B11O15(OH)9
Dana No: 25.07.01.01 Strunz No: 06.GB.15
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.