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Gageite-2M

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Formula:
(Mn,Mg,Zn)42Si16O54(OH)40
System:
Monoclinic
Lustre:
Vitreous
Name:
Gageite was named in 1910 by Alexander Hamilton Phillips in honor of Robert Burns Gage [November 20, 1875 Kaneville, Venango County, Pennsylvania, USA - 1946], of Trenton, New Jersey, USA, chemist with the New Jersey Highway Department. Gage analyzed the first specimens of gageite. Gage named chlorophoenicite and schallerite.
A polytype of Gageite

Classification of Gageite-2M

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
65.3.2.2a

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
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Type Occurrence of Gageite-2M

Physical Properties of Gageite-2M

Vitreous

Crystallography of Gageite-2M

Crystal System:
Monoclinic

Optical Data of Gageite-2M

Type:
Biaxial (-)
RI values:
nα = 1.720 nβ = 1.730 nγ = 1.730
2V:
Measured: 20° to 50°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong

Chemical Properties of Gageite-2M

Formula:
(Mn,Mg,Zn)42Si16O54(OH)40
Essential elements:
All elements listed in formula:

Other Names for Gageite-2M

Name in Other Languages:
German:Gageit-2M

Other Information

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 Gageite-2M

Reference List:
American Mineralogist (1987): 72: 382-391.

Internet Links for Gageite-2M

Localities for Gageite-2M

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.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Kuruman
        • N'Chwaning Mines
www.excaliburmineral.com
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
American Mineralogist (1987): 72: 382-391.
Mineral and/or Locality  
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