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Crystal System:
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 chemically analyzed the first specimens that would later be named gageite in his honor. Gage, who was both a chemist and a mineral collector, also named chlorophoenicite and schallerite.
A polytype of Gageite

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Classification of Gageite-2MHide

Discredited, 'Grandfathered' (first described prior to 1959)

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4

Physical Properties of Gageite-2MHide


Optical Data of Gageite-2MHide

Biaxial (-)
RI values:
nα = 1.720 nβ = 1.730 nγ = 1.730
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:
relatively strong

Chemical Properties of Gageite-2MHide


Crystallography of Gageite-2MHide

Crystal System:

First Recorded Occurrence of Gageite-2MHide

Other Language Names for Gageite-2MHide


Related Minerals - Dana Grouping (8th Ed.)Hide,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon.

Other InformationHide

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-2MHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1987): 72: 382-391.

Internet Links for Gageite-2MHide

Localities for Gageite-2MHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
South Africa
  • Northern Cape Province
    • Kalahari manganese field
      • Kuruman
        • N'Chwaning Mines
  • New Jersey
    • Sussex Co.
      • Franklin mining district
        • Franklin
American Mineralogist (1987): 72: 382-391.
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