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Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
From pseudo- + tachylite, a glassy rock generated by frictional heat within faults.
Fine Grained Rock, Opaque Rock
Talc carbonate is nothing but a rock sequence or a mineral composition found in metamorphic ultramafic rocks.
From medieval Latin, talcum
Fine Grained Rock, Opaque Rock