A System of Mineralogy Comprising the Most Recent Discoveries Including Full D
A System of Mineralogy Comprising the Most Recent Discoveries Including Full D
James Dwight Dana
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From Montmorillon ; Confolens in Charente ; and near St. Jean de Colle, in Dordogne. Smectite, Breithaupt, is from Cilley in Lower Styria, and Zeug in Croatia. Sup- posed formula Si 5i*4-6&, Malthacite of Breithaupt, (J. F. Pr. Ch. X, 610). In thin plates and massive ; soft like wax. Gr. =l'99 2-01; white or yellowish, and translucent. From basalt at Steindorfel, and greenstone near Beraun in Bohemia. Analyses : 1, Damour, (Bull. Soc. Geol. De Fr. [2], iv, 464); 2, L. A. Jordan, (Fogg. Ixxvii, ...591); 3, Meissner, (J. F. Pr. Ch. X, 510) : Bi 1 Pe Oa &g & fi 1. Montmorillonite, 60-04 20-16 0-68 1'46 0'23 1-27 26 '0=9 9 -84, Damour. 2. Smectite, 51'21 12'25 2'07 2'13 4'89 27 '89, Jordan. 3. Malthacite, 50'2 10-7 3'1 0'2 85'8, Meissner. RazoumoffsTcin of John, is another clayey or halloysite-like substance from Ko- semuth in Silesia. Zellner obtained Si 54'50, Xl 27 -25, Ca 2-00, Iklg 0'37, Fe 0-25, fl 14-25=98-62. ERDMANNITE, Berlin, Pogg. Ixxxviii, 160. In imbedded grains and folia : with no traces of crystallization.
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