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Chestermanite

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Formula:
Mg2(Fe3+,Mg,Al,Sb5+)O2BO3
System:
Orthorhombic
Colour:
greyish-green to black ...
Lustre:
Vitreous, Silky
Hardness:
6
Name:
Named by R.C. Erd and E.E. Foord in 1988 in honor of Charles Wesley Chesterman (2 February 1913, Lamed, Kansasm, USA – 25 March 1991, Napa California, USA), geologist and mineralogist, California Division of Mines and Geology, San Francisco, USA, who discovered the first specimens.
This page provides mineralogical data about Chestermanite.


Classification of Chestermanite

Approved
Approval Year:
1986
First Published:
1988
6.AB.40

6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
24.2.1.5

24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
9.8.4

9 : Borates
8 : Borates of Fe

Physical Properties of Chestermanite

Vitreous, Silky
Comment:
Vitreous to silky
Colour:
greyish-green to black in coarse crystals
Hardness (Mohs):
6
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.72(2) g/cm3 (Measured)    3.650 g/cm3 (Calculated)

Optical Data of Chestermanite

Type:
Biaxial (+)
RI values:
nα = 1.753 nβ = 1.763 nγ = 1.791
2V:
Measured: 63° , Calculated: 64°
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
distinct to strong

Chemical Properties of Chestermanite

IMA Formula:
Mg2(Fe3+,Mg,Al,Sb5+)O2BO3
Elements listed in formula:

Crystallography of Chestermanite

Crystal System:
Orthorhombic
Cell Parameters:
a = 18.53 Å, b = 12.27 Å, c = 6.04 Å
Ratio:
a:b:c = 1.51 : 1 : 0.492
Unit Cell Volume:
V 1,373.27 ų (Calculated from Unit Cell)
Morphology:
Type material: Typically fibrous; rare prismatic crystals extended on
[001] and flattened on {010}; predominant forms (in order of decreasing importance) are {ll0}, {210}, and {010}. Other forms identified: {100}, {130}, {120}, {230}, {540}, and {320}. No terminating forms were found. All crystals finely striated parallel to [01l].

Type Occurrence of Chestermanite

Place of Conservation of Type Material:
Holotype specimen (80-PP-2) and cotypic material preserved at the U.S. National Museum, Washington, D.C. (NMNH 165968)
Geological Setting of Type Material:
A lens of brucite marble, ~370 m2 in area, encased in a magnetite-forsterite skarn surrounded by schists and hornfels. The metamorphosed sediments are transected by dykes and sills of granodiorite.

Relationship of Chestermanite to other Species

Other Members of Group:
BlatteriteSb5+(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32
Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2
Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2
6.AB.05HambergiteBe2BO3(OH)
6.AB.10BerboriteBe2BO3(OH) · H2O
6.AB.15JeremejeviteAl6(BO3)5F3
6.AB.20Warwickite(Mg,Ti,Fe,Cr,Al)2O(BO3)
6.AB.20YuanfuliiteMg(Fe3+,Al)O(BO3)
6.AB.25Karlite(Mg,Alx)7(BO3)3(OH)4Cl1-x
6.AB.30AzoproiteMg2[(Ti,Mg),Fe3+]O2BO3
6.AB.30BonaccorditeNi2Fe3+O2(BO3)
6.AB.30FredrikssoniteMg2Mn3+O2(BO3)
6.AB.30LudwigiteMg2Fe3+O2(BO3)
6.AB.30VonseniteFe22+Fe3+O2(BO3)
6.AB.35Pinakiolite(Mg,Mn2+)2(Mn3+,Sb5+)O2(BO3)
6.AB.40BlatteriteSb35+Mn93+Mn352+(BO3)16O32
6.AB.40OrthopinakioliteMg2Mn3+O2(BO3)
6.AB.40TakéuchiiteMg2Mn3+O2BO3
6.AB.45HulsiteFe22+Fe3+O2(BO3)
6.AB.45MagnesiohulsiteMg2Fe3+O2(BO3)
6.AB.45AluminomagnesiohulsiteMg2AlO2(BO3)
6.AB.50FluoboriteMg3(BO3)F3
6.AB.50HydroxylboriteMg3(BO3)(OH)3
6.AB.55ShabyniteMg5BO3(OH)5Cl2 · 4H2O
6.AB.55WightmaniteMg5O(BO3)(OH)5 · 2H2O
6.AB.60GaudefroyiteCa4Mn33+(BO3)3(CO3)O3
6.AB.65SakhaiteCa48Mg16Al(SiO3OH)4(CO3)16(BO3)28 · (H2O)3(HCl)3
6.AB.70HarkeriteCa12Mg4Al(SiO4)4(BO3)3(CO3)5 · H2O
6.AB.75Pertsevite-(F)Mg2BO3F
6.AB.75Pertsevite-(OH)Mg2BO3(OH)
6.AB.80JacquesdietrichiteCu2BO(OH)5
6.AB.85PainiteCaZrAl9O15(BO3)
9.8.1VonseniteFe22+Fe3+O2(BO3)
9.8.2LudwigiteMg2Fe3+O2(BO3)
9.8.3FredrikssoniteMg2Mn3+O2(BO3)

Other Names for Chestermanite

Name in Other Languages:

Other Information

No UV fluorescence
Magnetism:
Non-Magnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chestermanite

Reference List:
Erd, R.C., Foord, E.E. (1988) Chestermanite, a new member of the ludwigite-pinakiolite group from Fresno County, California. The Canadian Mineralogist: 26: 911-916.

Jambor, J.L., Puziewicz, J. (1990) New mineral names. American Mineralogist: 75: 431-438.

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

Jambor, J.L. (1992) New mineral names. American Mineralogist: 77: 670-675.

Grew, E.S., Anovitz, L.M. (2002) BORON: Mineralogy, Petrology and Geochemistry, second edition.

Internet Links for Chestermanite

mindat.org URL:
https://www.mindat.org/min-998.html
Please feel free to link to this page.

Localities for Chestermanite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
USA (TL)
 
  • California
    • Fresno Co.
      • Lakeshore
Canadian Minelalogist Vol.26, pp. 911-916 (1988)
Mineral and/or Locality  
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