botryoidal aggregate

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Crystal habit — This article is about the descriptive term used in mineralogy. For the addictive drug, see crystal methamphetamine. Pyrite sun (or dollar) in laminated shale matrix. Between tightly spaced layers of shale, the aggregate was forced to grow in a… … Wikipedia
Cassiterite — Infobox mineral name = Cassiterite category = boxwidth = boxbgcolor = imagesize = caption = Cassiterite crystals formula = SnO2 molweight = color = purple, wine, black, reddish brown or yellow habit = Pyramidic, prismatic system = tetragonal; 4/m … Wikipedia

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