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protovermiculite
protovermiculite n.
Brit. 
/ˌprəʊtə(ʊ)vəˈmɪkjᵿlʌɪt/
, /ˌprəʊtə(ʊ)vəˈmɪkjᵿlʌɪt/U.S. /ˌproʊdoʊvərˈmɪkjəˌlaɪt/
[so named by G. A. Koenig (see quot. 1877) because it had exfoliated to a lesser degree than vermiculite and was therefore considered to be earlier] Mineralogy (now rare) a mineral similar in composition to vermiculite but containing less water, and occurring as large yellow or brown scales./ˌproʊdoʊvərˈmɪkjəˌlaɪt/ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > vermiculite(s) > varieties
jefferisite1866
kerrite1873
protovermiculite1877
philadelphite1881
1877 Proc. Acad. Nat. Sci. Philadelphia 269 Professor Geo. A. König described a micaceous mineral from Magnet Cove, Ark., to which he gave the name Protovermiculite... The mineral occurs in large foliated plates, loose in the soil.
1948 Amer. Mineralogist 33 656 Protovermiculite from Magnet Cove, Arkansas. Large golden yellow scales.
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