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Small Crystals in North Texas Soil  RSS feed

 
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Does anyone know what these small crystals found in North Texas soil from about 10 ft underground are?
20180430_155434.jpg
[Thumbnail for 20180430_155434.jpg]
 
Posts: 129
Location: Maritimes , Eastern Canada
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The color and shape resemble flourite/salt. Taste one best way to test , otherwise quartz but my bet is salt.
 
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Location: USDA Zone 8a
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It could be mica:

https://en.wikipedia.org/wiki/Mica


Could also be calcite ...


This maybe of interest:

http://www.dot.state.tx.us/Texas Rocks and Fossils
 
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Location: Vilonia, Arkansas - Zone 7B/8A stoney, sandy loam soil pH 6.5
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Really it is hard to say for certain but they look a lot like Feldspar crystals, the other possibilities are Asbestos, Gypsum, Selenite, among others.

This link is to a set of flash cards that teach mineral identification (very handy to have at your disposal for mineral ID)

rock and mineral ID flash cards

Redhawk
 
Posts: 1944
Location: Kent, UK - Zone 8
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They look a lot like gypsum.

Long needle-like structure, scratch with a finger nail? Fairly fragile?
 
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