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Gageite-2M

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Formula:
(Mn,Mg,Zn)
 
42
Si
 
16
O
 
54
(OH)
 
40
System:MonoclinicLustre: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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Dana 8th edition ID: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

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Physical Properties of Gageite-2M

Lustre: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°
Maximum Birefringence:δ = 0.010

Chart 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)
 
42
Si
 
16
O
 
54
(OH)
 
40
Simplified for copy/paste:(Mn,Mg,Zn)42Si16O54(OH)40
Essential elements:H, Mn, O, Si
All elements listed in formula:H, Mg, Mn, O, Si, Zn

Other Names for Gageite-2M

Other Languages:
German:Gageit-2M

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Gageite-2M

    The 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. ? 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 fields
        • Kuruman
          • N'Chwaning Mines
    www.excaliburmineral.com
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    American Mineralogist (1987): 72: 382-391.
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