Pitchstone; stone of fusible pitch, of a resinous appearance, compact, brown, reddish, gray, yellowish, blackish or bluish, rarely homogeneous, and often containing crystals of feldspar and scales of mica. It is the pechstein porphyry or obsidian of the Germans. It is called also retinasphalt.
Word of the Day: Catachrestical
An inflammable mineral resin, usually of a yellowish brown color, found in roundish masses, sometimes with coal.
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