Probertite Mineral Data

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.

Name Pronunciation:

Probertite + Pronunciation

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

Diaphaneity:

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:

Fluorescent, Short UV=butter yellow to lemon yellow, Long UV=butter yellow to lemon yellow.

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
Ncalc = 1.52

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:

Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Probertite =2.14 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Probertite= 1.73 barns/electron
U=PE_Probertite x rElectron Density= 3.76 barns/cc.

Radioactivity:

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

Probertite Classification

Dana Class:

26.05.12.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.12)Dana Group

26.05.12.01 Probertite NaCaB5O7(OH)4•3(H2O) P 2₁/a 2/m

26.05.12.02 Tuzlaite NaCaB508(0H)2•3(H2O) P 2₁/c 2/m

Strunz Class:

06.EB.15 06 - BORATES

06.E - Pentaborates

06.EB -Ino-pentaborates

06.EB.15 Probertite NaCaB5O7(OH)4•3(H2O) P 2₁/a 2/m

Other Probertite Information

References:

NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) 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 - 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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Ask about Probertite 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 Probertite Specimen Label here :

Probertite

NaCaB5O7(OH)4•3(H2O)
Dana No: 26.05.12.01 Strunz No: 06.EB.15
Locality:

Notes: