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Gates-Adah kimberlite dikes, Masontown, Fayette Co., Pennsylvania, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 39° North , 79° West (est.)
Margin of Error:~33km
Köppen climate type:Cfb : Temperate oceanic climate

Peridotite dikes, 2.5 miles northwest of Masontown. The Gates Adah Kimberlite is Upper Middle Jurassic (185mya) in age and is not diamondiferous.

Mineral List

13 valid minerals.

Rock Types Recorded

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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American Mineralogist (1984): 69: 30-40.
Stone, W.E. and Fleet, M.E. (1990) Platinum-iron alloy (Pt3Fe) in kimberlite from Fayette County, Pennsylvania. American Mieralogist: 75: 881-885.
Bikerman, Michael et al. (1997). New Phlogopite K-Ar Dates and the Age of Southwestern Pennsylvania Kimberlite Dikes.
Smith, R.C. and Barnes, J.H. (2006) Blue Gray by Day and Pinkish Purple by Night: Pennsylvania's Pyrope Garnets. Pennsylvania Geology: 36(4), 2-10.
Shultz, C.H. Jurassic Kimberlite Dikes. The Geology of Pennsylvania. Pennsylvania Geological Survey and Pittsburgh Geological Survey Special Publication 1, reprinted in 2002, pages 211-217.
Schulze, D. J., & Hearn, B. C. (2016). Mantle Xenocrysts from the Masontown, Pennsylvania Kimberlite: an Ordinary Mantle with Si-enriched Spinel. The Canadian Mineralogist 53:767-773

Mineral and/or Locality  
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