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About WilliamsiteHide

Named by Charles Upham Shepard in 1848 in honor of its discoverer, Lewis White Williams [December 20, 1804 Goshen, Pennsylvania - September 19, 1873], a mineralogist and geologist of West Chester, Chester County, Pennsylvania. Williams was on the 1857 "Camel Expedition" with Lieutenant Ned Beale.
A variety of Antigorite

A translucent pale apple-green variety of antigorite.

Visit for gemological information about Williamsite.

Pronounciation of WilliamsiteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Chemical Properties of WilliamsiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Williamsite associated with MagnetiteFe2+Fe3+2O4
2 photos of Williamsite associated with ChromiteFe2+Cr3+2O4
2 photos of Williamsite associated with EnstatiteMgSiO3
1 photo of Williamsite associated with AntigoriteMg3(Si2O5)(OH)4

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.

Internet Links for WilliamsiteHide

Localities for WilliamsiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
  • Maryland
    • Baltimore Co.
      • Bare Hills
Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland, 27p.
    • Harford Co.
      • Jarretsville-Dublin Mining District
Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 765-766.
Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
      • Woodensburg-Cardiff Mining District
        • Cardiff
Minerals of Maryland (1940) Charles Ostrander and Walter E. Price, Jr., Natural History Society of Maryland. p. 56
  • Pennsylvania
    • Lancaster Co.
      • State Line Chromite Mining District
        • Fulton Township,11,54067,54302
A.Mathauser collection; Pearre, N. C., & Heyl Jr, A. V. (1960). Chromite and other mineral deposits in serpentine rocks of the piedmont upland, Maryland, Pennsylvania, and Delaware (No. 1082-K, pp. 707-833). US Government Printing Office.
Samuel G. Gordon (1922) The Mineralogy of Pennsylvania. Pg. 204. Dana 6:1069. Ref2) American Republican, Jan. 2nd 1849 (Chester Co., Newspaper)
        • Little Britain Township
          • Texas
Samuel G. Gordon (1922) The Mineralogy of Pennsylvania. Pg. 204. Dana 6:1069.
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