Chestermanite Mineral Data

Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals

General Chestermanite Information

Chemical Formula:

Mg2(Fe+++,Mg,Al,Sb+++++)BO3O2

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

Empirical Formula:

Mg₂Fe³⁺_0.6Mg_0.2Al_0.1Sb_0.1BO₅

IMA Status:

Approved IMA 1988

Locality:

Twin Lakes region, Fresno County, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Charles W. Chesterman (1913-1991), U. S. Geologist who discovered the mineral.

Synonym:

ICSD 71036

PDF 45-1415

Chestermanite Image

Images:

Click Here for Larger Chestermanite 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

Axial Ratios:

a:b:c =1.5095:1:0.2462

Cell Dimensions:

a = 18.525, b = 12.272, c = 3.0218, Z = 8; V = 686.97 Den(Calc)= 3.73

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.114(1), 2.559(0.91), 2.169(0.57),

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

Alfredsson V , Bovin J O , Norrestam R , Terasaki O , Acta Chemica Scandinavica , 45 (1991) p.797-804, The structure of the mineral chestermanite,, Mg2.25Al0.16Fe0.43Ti0.02Sb0.13O2BO3. A combined single-crystal X-ray and HREM, study

Physical Properties of Chestermanite

Cleavage:

None

Color:

Gray green, Black, Black green.

Density:

3.72

Diaphaneity:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6 - Orthoclase

Luster:

Vitreous - Silky

Streak:

light gray green

Optical Properties of Chestermanite

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

Optical Data:

Biaxial (+), a=1.753, b=1.763, g=1.791, bire=0.0380, 2V(Calc)=64, 2V(Meas)=63.

Pleochroism (x):

dark blue green.

Pleochroism (y):

green.

Pleochroism (z):

pale yellow brown.

Calculated Properties of Chestermanite

Electron Density:

Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Chestermanite =3.72 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Chestermanite}= 25.12 barns/electron
U=PE_{Chestermanite} x rElectron Density= 90.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chestermanite is Not Radioactive

Chestermanite Classification

Dana Class:

24.02.01.05 (24)Borates - Anhydrous

(24.02)where (A)2 BO2 [XO3]

(24.02.01)Ludwigite Group (Space Group: Pbam)

24.02.01.01 Ludwigite Mg2FeBO5 Pbam 2/m 2/m 2/m

24.02.01.02 Vonsenite Fe2FeBO5 Pbam 2/m 2/m 2/m

24.02.01.03 Azoproite (Mg,Fe)2(Fe,Ti,Mg)BO5 Pbam 2/m 2/m 2/m

24.02.01.04 Bonaccordite Ni2FeBO5 Pbam 2/m 2/m 2/m

24.02.01.05 Chestermanite Mg2(Fe,Mg,Al,Sb)BO3O2 Pbam 2/m 2/m 2/m

24.02.01.06 Fredrikssonite Mg2(Mn,Fe)O2(BO3) Pbam 2/m 2/m 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p431,1990) OPTIC PROP.(Dana8)

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 - 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 Chestermanite using:

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

Visit our Advertisers for Chestermanite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Chestermanite Mineral Data :

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 Español

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

Chestermanite

Mg2(Fe+++,Mg,Al,Sb+++++)BO3O2
Dana No: 24.02.01.05 Strunz No: 06.AB.40
Locality:

Notes: