datolite (original) (raw)

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| | Name: | datolite | | | | | | | ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- | --------- | ------ | --------- | ----- | | | Class: | Silicates | | | | | | | | Chemistry: | CaB(SiO4)(OH) hydrous calcium borosilicate | | | | | | | | Color(s): | colorless, white, yellowish, green, rarely red or gray | | | | | | | | Hardness: | 5 - 5.5 | SpecGrav: | 2.8 - 3.0 | | | | | | Fracture: | uneven, conchoidal | Cleavage: | none | | | | | | Crystal: | monoclinic, short prismatic, thick tabular, and unusual porcelaneous nodules from Michigan | | | | | | | | Envronment: | Secondary mineral in basalt cavities, serpentinites, and sometimes with zeolites. | | | | | | | | Association: | prehnite, apophyllite, wollastonite, diopside, copper, quartz, stilbite, heulandite | | | | | | | | Locals: | | New Jersey, Mich., USA | Germany | Italy | Norway | Australia | USSR| | | | Misc: | The name is from the Greek "dateisthai", meaning "to divide", as it often crumbles easily. Flame test is green, and it is slightly soluble in Hydrochloric acid. | | | | | | | | | | | | | | |

| | Photos & Locals: | | | | | | ------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | | | | | 1.) Caledonia Mine, Ontonagon Co., Michigan, USA 2.) Caledonia Mine, Ontonagon Co., Michigan, USA | 3.) Caledonia Mine, Ontonagon Co., Michigan, USA (closeup, notice metallic copper) 4.) Caledonia Mine, Ontonagon Co., Michigan, USA (closeup, notice metallic copper) | | |

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