Parasibirskite Mineral Data

General Parasibirskite Information

Chemical Formula:

Ca2B2O5•(H2O)

Composition:

Molecular Weight = 199.79 gm

Calcium 40.12 % Ca 56.14 % CaO

Boron 10.82 % B 34.85 % B₂O₃

Hydrogen 1.01 % H 9.02 % H₂O

Oxygen 48.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂B₂O₅•(H₂O)

Environment:

In a vein between gehlenite-spurrite skarns and crystalline limestone. A polymorph of sibirskite.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Fuka, Okayama Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

For it's relationship to sibirskite.

Name Pronunciation:

Parasibirskite + Pronunciation

Synonym:

IMA1996-051

Parasibirskite Image

Images:

Parasibirskite

Comments: White massive parasibirskite.
Location: Fuka, Bicchu-cho, Kawakami-gun, Okayama-ken, Japan. Scale: Specimen size 1.5 x 2 cm.
© Diederik Visser

Parasibirskite Crystallography

Axial Ratios:

a:b:c =1.2363:1:0.6538

Cell Dimensions:

a = 6.722, b = 5.437, c = 3.555, Z = 1; beta = 93° V = 129.75 Den(Calc)= 2.56

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.237(1), 6.73(0.7), 2.975(0.6),

Physical Properties of Parasibirskite

Cleavage:

{100} Perfect

Color:

White.

Density:

2.5

Diaphaneity:

Transparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Parasibirskite

Gladstone-Dale:

CI meas= -0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2359,KPDmeas= 0.2416,KC= 0.2235
Ncalc = 1.56 - 1.57

Optical Data:

Biaxial (+), a=1.556, b=1.593, g=1.663, bire=0.1070

Calculated Properties of Parasibirskite

Electron Density:

Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Parasibirskite =2.56 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Parasibirskite}= 5.05 barns/electron
U=PE_{Parasibirskite} x rElectron Density= 12.94 barns/cc.

Radioactivity:

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

Parasibirskite Classification

Dana Class:

26.07.01.02 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.07)Dana Type

(26.07.01)Dana Group

26.07.01.01 Korzhinskite CaB2O4•(H2O) P 2/m 2/m

26.07.01.02 Parasibirskite! Ca2B2O5•(H2O) P 2₁/m 2/m

Strunz Class:

06.BC.20 06 - BORATES

06.B - Diborates

06.BC -Ino-diborates with triangles and/or tetrahedra

06.BC.20 Parasibirskite! Ca2B2O5•(H2O) P 2₁/m 2/m

06.BC.20 Sibirskite CaHBO3 P 2₁/a 2/m

Other Parasibirskite Information

References:

NAME( MinRec) PHYS. PROP.(Min.Mag.,Vol.62,p521-525,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Parasibirskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Parasibirskite

Ca2B2O5•(H2O)
Dana No: 26.07.01.02 Strunz No: 06.BC.20
Locality:

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