Probertite Mineral Data

Probertite Mineral Data +

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General Probertite Information

Chemical Formula:

NaCaB5O7(OH)4·3(H2O)

Composition:

Molecular Weight = 351.19 gm

Sodium 6.55 % Na 8.82 % Na₂O

Calcium 11.41 % Ca 15.97 % CaO

Boron 15.39 % B 49.56 % B₂O₃

Hydrogen 2.87 % H 25.65 % H₂O

Oxygen 63.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCaB₅O₇(OH)₄·3(H₂O)

Environment:

Kramer borate deposits.

IMA Status:

Valid Species (Pre-IMA) 1929

Locality:

Boron, Kern Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Frank H. Probert (1876-1940), University of California, who discovered the mineral.

Synonym:

ICSD 35245

PDF 12-420

Probertite Image

Images:

Probertite

Comments: Large colorless prismatic crystal of probertite.
Location: Niedersachswerfen, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale: Crystal length 4.7 cm.
© Thomas Witzke / Abraxas-Verlag

Probertite Crystallography

Axial Ratios:

a:b:c =1.0684:1:0.5241

Cell Dimensions:

a = 13.43, b = 12.57, c = 6.589, Z = 4; beta = 100.3° V = 1,094.40 Den(Calc)= 2.13

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): 9.12(1), 2.807(0.35), 6.62(0.2),

Forms:

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Forms: [ 0 1 0] [ 1 0 1] [ 1 1 0] [ 1 1 1] [ 1 0 0]

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Crystal Structure:

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Menchetti S , Sabelli C , Trosti-Ferroni R , Acta Crystallographica, Section B , 38 (1982) p.3072-3075, Probertite, CaNa[B5O7(OH)4]*3H2O: a refinement

Physical Properties of Probertite

Cleavage:

[???] Perfect

Color:

Colorless.

Density:

2.14

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Probertite

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2474,KPDmeas= 0.2463,KC= 0.2441

Optical Data:

Biaxial (+), a=1.514, b=1.524, g=1.543, bire=0.0290, 2V(Calc)=74, 2V(Meas)=73. Dispersion relatively weak.

Calculated Properties of Probertite

Electron Density:

r_electron=2.17 gm/cc
note: r_Probertite=2.14 gm/cc.

Fermion Index

Fermion Index = 0.03109
Boson Index = 0.96891

Photoelectric:

PE_Probertite= 1.73 barns/electron
U=PE_Probertite x r_electron= 3.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Probertite is Not Radioactive

Probertite Classification

Dana Class:

26.5.12.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.5)Dana Type

(26.5.12)Dana Group

26.5.12.1 Probertite NaCaB5O7(OH)4·3(H2O) P 2₁/a 2/m

26.5.12.2 Tuzlaite NaCaB508(0H)2·3(H2O) P 2₁/c 2/m

Strunz Class:

V/J.05-30 V - Nitrates, Carbonates and Borates

V/J - Chain borates with [B2O4]2- to [B6O10]2-

V/J.05 - Larderellite - Kaliborite series

V/J.05-10 Larderellite (NH4)B5O6(OH)4 P 2₁/a 2/m

V/J.05-20 Ezcurrite Na4B10O17·7(H2O) P1 1

V/J.05-30 Probertite NaCaB5O7(OH)4·3(H2O) P 2₁/a 2/m

V/J.05-40 Kaliborite KHMg2B12O16(OH)10·4(H2O) C 2/c 2/m

Other Probertite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Probertite :
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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Probertite

NaCaB5O7(OH)4·3(H2O)
Dana No: 26.5.12.1 Strunz No: V/J.05-30
Locality:

Notes: