Specimen Details
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Number Of Specimens
1
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Specimen Nature
Form: Hand Specimen(s)
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Rock Name
Welded Basalt Tuff
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Rock Class
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Rock Group
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Rock Description
This specimen is composed of numerous, angular to rounded fragments of very fine grained to glassy, black basalt (,1cm) in a matrix of very small angular fragments in a yellowish-brown groundmass. The specimen is somewhat vesicular and many vesicles are filled with various minerals including pyrite. Previously called Variety Tachylite. With Pyrite.
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Category
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Scientific Group
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Discipline
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Collecting Areas
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Type of Item