Note on rock-forming minerals in the Joetsu district, Niigata Prefecture, Japan. (13) Tremolite-actinolite from the Kotaki-Omi district.
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Actinolite-tremolite series occur in the contact between crystalline schists and serpentinite, and xenolith in serpentinite, Hisui-kyo (jadeite valley), Omi, Niigata Prefecture. Tremolite coexists with serpentine, chlorite and Cr-muscovite. The chemical variation of amphibole is small. Amphibole in pumpellyite, chlorite and actinolite bearing green rock from Hisui-kyo (jadeite valley), Kotaki varies in composition from tremolite through actinolite to magnesiohornblende. Tremolite molecule of the amphibole is from 67.5 mol. % to 88.7 mol. %, with small amounts of cummingtonite, edenite, richterite and glaucophane molecules. Unit-cell dimensions of actinolite coexisted with pumpellyite are a = 9.886 (8) , b = 18. 12(1), c = 5.223(6), β = 105.3(1)^o, v = 902.3(13)^3 and those of tremolite coexisted with Cr-muscovite are a = 9.854 (9) , b = 18.06 (1) , c = 5.223 (2) , β = 105.0 (2)^o, v = 898.4 (13) ^3. These unit-cell dimensions of these amphiboles are similar.
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