Leidyite
A material that is NOT an approved mineral species
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Dr Joseph Leidy
Formula:
(Fe,Mg,Ca)2Al2Si5O15 · 5H2O
Formula approximated on 1878 analysis, very unlikely to be accurate.
Colour:
Grass-green, Olive-green, greenish-grey, sometimes bluish-green.
Lustre:
Waxy
Hardness:
1 - 2
Name:
Named after Dr. Joseph Leidy (1823-1891), a reknowned paleontologist from Philadelphia.
First Recorded Locality:
Occurs as warty olive-green, vitreous masses associated with thulite and other species in cavities in a granitic pegmatite of the Wissahickon formation.
Possibly an impure zeolite or perhaps something like ferrosaponite?
Possibly an impure zeolite or perhaps something like ferrosaponite?
Unique Identifiers
Mindat ID:
10817
Long-form identifier:
mindat:1:1:10817:7
Physical Properties of Leidyite
Waxy
Comment:
When crushed takes a silky lustre parting into fine white scales.
Colour:
Grass-green, Olive-green, greenish-grey, sometimes bluish-green.
Streak:
White
Hardness:
1 - 2 on Mohs scale
Hardness Data:
Measured
Chemistry of Leidyite
Mindat Formula:
(Fe,Mg,Ca)2Al2Si5O15 · 5H2O
Formula approximated on 1878 analysis, very unlikely to be accurate.
Formula approximated on 1878 analysis, very unlikely to be accurate.
First Recorded Occurrence of Leidyite
Other Language Names for Leidyite
Other Information
Health Risks:
König, George A. (1878). On the Association of Grossularite, Zoisite, Heulandite, and Leidyite: A New Species. Proceedings of the Academy of Natural Sciences of Philadelphia, 81-85. https://www.jstor.org/stable/pdf/4060368.pdf
König, George A. (1882). Note on Zeolites from Delaware County. Proceedings of the Academy of Natural Sciences of Philadelphia, 288-289.
Peters, J. J. (1984). Classic Pegmatite Occurrences In: Delaware County, Pennsylvania. Rocks & Minerals, 59(3), 109-119. https://www.tandfonline.com/doi/pdf/10.1080/00357529.1984.11764460?casa_token=cZEdN1tOrmsAAAAA:XiTRPChs4Kn0XMUB_E7TRHvmuxaraOS0tSY4m-ogMrR2UoUGaQai1dIVqlc12zGFGGR5ICBNk7R_Jw
König, George A. (1882). Note on Zeolites from Delaware County. Proceedings of the Academy of Natural Sciences of Philadelphia, 288-289.
Peters, J. J. (1984). Classic Pegmatite Occurrences In: Delaware County, Pennsylvania. Rocks & Minerals, 59(3), 109-119. https://www.tandfonline.com/doi/pdf/10.1080/00357529.1984.11764460?casa_token=cZEdN1tOrmsAAAAA:XiTRPChs4Kn0XMUB_E7TRHvmuxaraOS0tSY4m-ogMrR2UoUGaQai1dIVqlc12zGFGGR5ICBNk7R_Jw
Internet Links for Leidyite
mindat.org URL:
https://www.mindat.org/min-10817.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Leidyite
Reference List:
Localities for Leidyite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA (FRL) | |
| Dana (1892) |