Probertite Mineral Data

[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows

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:

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Probertite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Probertite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Probertite Mineral Data :

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: