Williamsite
A variety of Antigorite
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About Williamsite
Formula:
Mg3(Si2O5)(OH)4
Name:
Named by Charles Upham Shepard in 1848 in honour of its discoverer, Lewis White Williams (20 December 1804, East Goshen Township, Chester County, Pennsylvania, USA - 19 September 1873, West Chester, Chester County, Pennsylvania, USA), a mineralogist and geologist of West Chester, Chester County, Pennsylvania. Williams was on the 1857 "Camel Expedition" with Lieutenant Ned Beale. White was tasked with noting the geologic formations encountered during the expedition, which used 77 camels to carry gear from Indianola, Texas to Fort Tejon, California.
A translucent, pale apple-green variety of antigorite.
Visit gemdat.org for gemological information about Williamsite.
Visit gemdat.org for gemological information about Williamsite.Unique Identifiers
Mindat ID:
27232 (as Williamsite)
260 (as Antigorite)
260 (as Antigorite)
Long-form identifier:
mindat:1:1:27232:0 (as Williamsite)
mindat:1:1:260:6 (as Antigorite)
mindat:1:1:260:6 (as Antigorite)
Similar Names
| Willemseite | A valid IMA mineral species | Ni3Si4O10(OH)2 |
Pronunciation of Williamsite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Chemistry of Williamsite
Mindat Formula:
Mg3(Si2O5)(OH)4
Element Weights:
Elements listed:
Common Associates
Associations Based on Photo Data:
| 6 photos of Williamsite associated with Chromite | Fe2+Cr3+2O4 |
| 3 photos of Williamsite associated with Margarite | CaAl2(Al2Si2O10)(OH)2 |
| 2 photos of Williamsite associated with Magnetite | Fe2+Fe3+2O4 |
| 2 photos of Williamsite associated with 'Nephrite' | |
| 1 photo of Williamsite associated with Antigorite | Mg3(Si2O5)(OH)4 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Williamsite
mindat.org URL:
https://www.mindat.org/min-27232.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Williamsite
Reference List:
Localities for Williamsite
Showing 10 localities.
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 | |
| Mason (1976) |
| Ostrander et al. (1940) |
| Ostrander et al. (1940) +1 other reference |
| Pearre (1960) |
| Ostrander et al. (1940) | |
| Ostrander et al. (1940) | |
| www.mindat.org (n.d.) |
| A.Mathauser collection +1 other reference | |
| Gordon (1922) | |
| Gordon (1922) |
Line pit, Fulton Township, Lancaster County, Pennsylvania, USA