Mineralogy Database

Probertite Mineral Data

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General Probertite Information

Help on Chemical  Formula: Chemical Formula: NaCaB5O7(OH)4•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaCaB5O7(OH)4•3(H2O)
Help on Environment: Environment: Kramer borate deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1929
Help on Locality: Locality: Boron, Kern Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frank H. Probert (1876-1940), University of California, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Probertite + Pronunciation Say PROBERTITE
Help on Synonym: Synonym: ICSD 35245
  PDF 12-420

Probertite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0684:1:0.5241
Help on Cell Dimensions: Cell Dimensions: a = 13.43, b = 12.57, c = 6.589, Z = 4; beta = 100.3° V = 1,094.40 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.12(1), 2.807(0.35), 6.62(0.2),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 0 1) ( 1 1 0) ( 1 1 1) ( 1 0 0)

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Physical Properties of Probertite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.14
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Short UV=butter yellow to lemon yellow, Long UV=butter yellow to lemon yellow.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Probertite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Probertite =2.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEProbertite = 1.73 barns/electron
U=PEProbertite x rElectron Density= 3.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Probertite is Not Radioactive

Probertite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)Dana Type
  (26.05.12)Dana Group Probertite NaCaB5O7(OH)4•3(H2O) P 21/a 2/m Tuzlaite NaCaB508(0H)2•3(H2O) P 21/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 06.EB.15





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