Mindat Logo


This page is currently not sponsored. Click here to sponsor this page.

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 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
mindat.org URL:http://www.mindat.org/min-6960.html
Please feel free to link to this page.

Type Occurrence of Gageite-2M

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

Physical Properties of Gageite-2M


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

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:

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

Search Engines:
  • Look for Gageite-2M on Google
  • Look for Gageite-2M images on Google
  • External Links:
  • Look for Gageite-2M on Webmineral
  • Look for Gageite-2M on Athena Mineralogy
  • Look for Gageite-2M on Mineralien Atlas [Link dead]
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Buy minerals from YourMineralCollection
  • Buy from McDougall Minerals
  • SpiriferMinerals.com - high quality low prices
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Fabre Minerals - search for Gageite-2M specimens
  • Buy from Dave Bunk Minerals
  • Lapis Mineral Magazin
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Buy RARE Minerals from Rocks of Africa
  • High-end worldwide specimens & outstanding customer service
  • Search for Gageite-2M on Well-Arranged Molecules
  • Gageite-2M specimens for sale - minfind.com
  • Jobs:
  • Mining & Geology Jobs
  • 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
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    American Mineralogist (1987): 72: 382-391.
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: January 6, 2014 19:11:47
    Mineral and Locality Search
    and/or Locality:
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds