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Gageite-2M

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

    Hide Locality List
    (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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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the 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 hundreds 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: 21st Jun 2011 17:35:52
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