reniform 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
Sperrylite — Infobox mineral name = Sperrylite boxwidth = caption = formula = PtAs2 color = tin white habit = well formed finely crystalline, massive to reniform system = cubic cleavage = cubic indistinct fracture = conchoidal mohs = 6 7 luster = metallic… … Wikipedia
Glossary of botanical terms — Many of the terms used in Wikipedia glossaries (often most) are already defined and explained within Wikipedia itself. However, lists like the following indicate where new articles need to be written and are also useful for looking up and… … 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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