Mineralogy Database

Chestermanite Mineral Data

Search Webmineral :

General Chestermanite Information

Help on Chemical  Formula: Chemical Formula: Mg2(Fe+++,Mg,Al,Sb+++++)BO3O2
Help on Composition: Composition: Molecular Weight = 192.66 gm
   Magnesium  27.75 %  Mg   46.02 % MgO
   Aluminum    1.40 %  Al    2.65 % Al2O3
   Iron       17.39 %  Fe   24.87 % Fe2O3
   Boron       5.61 %  B    18.07 % B2O3
   Antimony    6.32 %  Sb    8.40 % Sb2O5
   Oxygen     41.52 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2Fe3+0.6Mg0.2Al0.1Sb0.1BO5
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Twin Lakes region, Fresno County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles W. Chesterman (1913-1991), U. S. Geologist who discovered the mineral.
Help on Synonym: Synonym: ICSD 71036
  PDF 45-1415

Chestermanite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Chestermanite   Ludwigite

Comments: Black capillary crystals of ludwigite with green inclusions of chestermanite in impure marble.
Location: Near Potter Pass, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chestermanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5095:1:0.2462
Help on Cell Dimensions: Cell Dimensions: a = 18.525, b = 12.272, c = 3.0218, Z = 8; V = 686.97 Den(Calc)= 3.73
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.114(1), 2.559(0.91), 2.169(0.57),

Physical Properties of Chestermanite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray green, Black, Black green.
Help on Density: Density: 3.72
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: light gray green

Optical Properties of Chestermanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.094 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2062,KPDmeas= 0.2067,KC= 0.2275
Ncalc = 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.753, b=1.763, g=1.791, bire=0.0380, 2V(Calc)=64, 2V(Meas)=63.
Help on Pleochroism (x): Pleochroism (x): dark blue green.
Help on Pleochroism (y): Pleochroism (y): green.
Help on Pleochroism (z): Pleochroism (z): pale yellow brown.

Calculated Properties of Chestermanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Chestermanite =3.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEChestermanite = 25.12 barns/electron
U=PEChestermanite x rElectron Density= 90.60 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chestermanite is Not Radioactive

Chestermanite Classification

Help on  Dana Class: Dana Class: (24)Borates - Anhydrous
  (24.02)where (A)2 BO2 [XO3]
  (24.02.01)Ludwigite Group (Space Group: Pbam) Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 06.AB.40 06 - BORATES
  06.A - Monoborates
  06.AB -BO3, with additional anions; 1(D) + OH, etc.
06.AB.40 Blatterite (Mn,Mg)35Sb3(Mn,Fe)9(BO3)16O32 Pnnm 2/m 2/m 2/m
06.AB.40 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m
06.AB.40 Orthopinakiolite (Mg,Mn)2MnBO5 Pnnm 2/m 2/m 2/m
06.AB.40 Takeuchiite Mg2MnO2(BO3) Pnnm 2/m 2/m 2/m

Other Chestermanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p431,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Chestermanite :
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

Search for Chestermanite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Chestermanite :

Ask about Chestermanite 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 Espa´┐Żol

Print or Cut-and-Paste your Chestermanite Specimen Label here :


Dana No: Strunz No: 06.AB.40





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.