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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 Synonym: Synonym: ICSD 35245
  PDF 12-420
 

Probertite Image

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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

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 - PrismaticH-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:

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

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Click Here for Large Probertite Structure Window 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

Help on Cleavage: Cleavage: [???] Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.14
Help on Diaphaniety: Diaphaniety: 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: Non-fluorescent.
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
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:

relectron=2.17 gm/cc
note: rProbertite =2.14 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03109
Boson Index = 0.96891
Help on Photoelectric: Photoelectric:

PEProbertite = 1.73 barns/electron
U=PEProbertite x relectron= 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: 26.5.12.1 (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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) 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 -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:

 

 
   
 
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