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protodolomite
protodolomite n. 
/ˌproʊdoʊˈdɑləˌmaɪt/ Mineralogy a mineral (first identified as an artificial product) with a composition near that of dolomite, CaMg(CO3)2, but an imperfect crystal structure.
Brit. /ˌprəʊtə(ʊ)ˈdɒləmʌɪt/
, /ˌprəʊtə(ʊ)ˈdɒləmʌɪt/U.S. /ˌproʊdoʊˈdoʊləˌmaɪt/
, /ˌproʊdoʊˈdoʊləˌmaɪt//ˌproʊdoʊˈdɑləˌmaɪt/ΘΚΠ
the world > the earth > minerals > types of mineral > carbonates > [noun] > hexagonal > dolomite > varieties
pearl spar1793
miemite1804
rhomb spar1804
gurhofite1816
brown-spar1843
pennite1850
tharandite1850
kutnahorite1907
huntite1953
protodolomite1955
1955 D. L. Graf & J. R. Goldsmith in Bull. Geol. Soc. Amer. 66 1566 These poorly ordered near dolomites, or protodolomites, also have been observed to form during the rapid cooling of dry periclase-calcite assemblages through the dolomite stability field.
1967 Oceanogr. & Marine Biol. 5 151 The deficiency of magnesium in the Red Sea brine might be caused by dolomitization of the carbonate rocks (some evidence of which is found in the presence of crystals of protodolomite in the core from the Discovery Deep).
1995 Paleogeogr., Palaeoclimatol., Palaeoecol. 113 43 Gypsum precipitation..probably assisted the process by raising the Mg/Ca ratio and reducing the number of competing ions until formation of protodolomite by early diagenetic replacerment took place.
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