Krauskopfite Mineral Data

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General Krauskopfite Information

Chemical Formula:

BaSi2O4(OH)2•2(H2O)

Composition:

Molecular Weight = 327.54 gm

Barium 41.93 % Ba 46.81 % BaO

Silicon 17.15 % Si 36.69 % SiO₂

Hydrogen 1.85 % H 16.50 % H₂O

Oxygen 39.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaSi₂O₄(OH)₂•2(H₂O)

Environment:

In veins cutting sanbornite-quartz-bearing gneissic metamorphic rocks.

IMA Status:

Approved IMA 1965

Locality:

Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Konrad Bates Krauskopf (1910- ), Professor of Geochemistry, Stanford University, Palo Alto, California, USA.

Name Pronunciation:

Krauskopfite + Pronunciation

Synonym:

ICSD 26971

PDF 18-192

Krauskopfite Image

Images:

Krauskopfite

Comments: White pearly crystalline krauskopfite on quartz.
Location: Rush Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Krauskopfite Crystallography

Axial Ratios:

a:b:c =0.7964:1:0.7378

Cell Dimensions:

a = 8.46, b = 10.622, c = 7.837, Z = 4; beta = 94.53° V = 702.05 Den(Calc)= 3.10

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.84(1), 5.34(0.45), 6.36(0.45),

Crystal Structure:

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Coda A , dal Negro A , Rossi G , Atti della Accademia Nazionale dei Lincei , 42 (1967) p.859-873, The crystal structure of krauskopfite, Locality: Rush Creek locality, Fresno County, California

Physical Properties of Krauskopfite

Cleavage:

{010} Perfect, {001} Perfect

Color:

Colorless, White.

Density:

3.14

Diaphaneity:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4 - Fluorite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Krauskopfite

Gladstone-Dale:

CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1892,KPDmeas= 0.1868,KC= 0.1923
Ncalc = 1.6

Optical Data:

Biaxial (-), a=1.574, b=1.587, g=1.599, bire=0.0250, 2V(Calc)=86, 2V(Meas)=88.

Calculated Properties of Krauskopfite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Krauskopfite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Krauskopfite= 179.48 barns/electron
U=PE_Krauskopfite x rElectron Density= 523.18 barns/cc.

Radioactivity:

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

Krauskopfite Classification

Dana Class:

74.03.04.02 (74)Phyllosilicate Modulated Layers

(74.03)with joined strips

(74.03.04)Ba phyllosilicates

74.03.04.01 Sanbornite BaSi2O5 Pmnb 2/m 2/m 2/m

74.03.04.02 Krauskopfite BaSi2O4(OH)2•2(H2O) P 2₁/a 2/m

Strunz Class:

09.DH.30 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.30 Krauskopfite BaSi2O4(OH)2•2(H2O) P 2₁/a 2/m

Other Krauskopfite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Krauskopfite :
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

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Krauskopfite

BaSi2O4(OH)2•2(H2O)
Dana No: 74.03.04.02 Strunz No: 09.DH.30
Locality:

Notes: