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Wightmanite Mineral Data

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General Wightmanite Information

Help on Chemical  Formula: Chemical Formula: Mg5(BO3)O(OH)5•2(H2O)
Help on Composition: Composition: Molecular Weight = 317.40 gm
   Magnesium  38.29 %  Mg   63.49 % MgO
   Boron       3.41 %  B    10.97 % B2O3
   Hydrogen    2.86 %  H    25.54 % H2O
   Oxygen     55.45 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg5(BO3)O(OH)5•2(H2O)
Help on Environment: Environment: Contact metamorphosed limestone.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Crestmore Quarry, 5 miles NW of Riverside, Riverside Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Randall H. Wightman (1915-1969), Director of Exploration and Mining of the Riverside Cement Co., Riverside, California, USA.
Help on Name Pronunciation: Name Pronunciation: Wightmanite + Pronunciation Say WIGHTMANITE
Help on Synonym: Synonym: ICSD 34371
  PDF 14-640

Wightmanite Image

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Comments: Tan silky prismatic wightmanite in pale blue calcite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wightmanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.3391:1:5.8575
Help on Cell Dimensions: Cell Dimensions: a = 13.46, b = 3.102, c = 18.17, Z = 4; beta = 91.6° V = 758.35 Den(Calc)= 2.78
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.07(1), 10.7(1), 3.03(0.3),

Physical Properties of Wightmanite

Help on Cleavage: Cleavage: {010} Perfect, {100} Distinct
Help on Color: Color: Colorless, Light green.
Help on Density: Density: 2.6
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Wightmanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.095 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2149,KPDmeas= 0.2297,KC= 0.2374
Ncalc = 1.62 - 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.585, b=1.603, g=1.604, bire=0.0190, 2V(Calc)=26, 2V(Meas)=33.

Calculated Properties of Wightmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Wightmanite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEWightmanite = 0.96 barns/electron
U=PEWightmanite x rElectron Density= 2.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wightmanite is Not Radioactive

Wightmanite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.01)Dana Type
  (26.01.02)Dana Group Wightmanite Mg5(BO3)O(OH)5•2(H2O) I2/m 2/m
Help on  Strunz Class: Strunz Class: 06.AB.55 06 - BORATES
  06.A - Monoborates
  06.AB -BO3, with additional anions; 1(D) + OH, etc.
06.AB.55 Shabynite Mg5(BO3)Cl2(OH)5•4(H2O) Unk. Mono
06.AB.55 Wightmanite Mg5(BO3)O(OH)5•2(H2O) I2/m 2/m

Other Wightmanite Information

Help on References: References: NAME( MinRec) 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 Wightmanite :
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.AB.55





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