. Bulletin - New York State Museum. Science. 106 NEW YORK STATE MUSEUM SubsiUcates The minerals here included are probably either metasilicates or orthosilicates, which, for lack of definite knowledge regarding their constitution, have been classed by Dana under this head. Humite group This group includes the species chondrodite, humite and clino- humite. They are basic fluosilicates of magnesium and are closely related chemically. They occur in crystals which are extremely complicated (chondrodite and clinohumite are mono- clinic, and humite is orthorhombic). Clinohumite and chondro- dite occ
. Bulletin - New York State Museum. Science. 106 NEW YORK STATE MUSEUM SubsiUcates The minerals here included are probably either metasilicates or orthosilicates, which, for lack of definite knowledge regarding their constitution, have been classed by Dana under this head. Humite group This group includes the species chondrodite, humite and clino- humite. They are basic fluosilicates of magnesium and are closely related chemically. They occur in crystals which are extremely complicated (chondrodite and clinohumite are mono- clinic, and humite is orthorhombic). Clinohumite and chondro- dite occur in compact masses and disseminated grains. A vit- reous to resinous luster is common to the group and the general color is red, brownish red, brown to yellow. The humite group occur mainly in ejected masses of limestone and are associated with chrysolite, biotite, pyroxene, magnetite, spinel, etc. The minerals of the humite group are all found at the Tilly Foster mine, Putnam co. N. Y. Calamin H2ZnSi00 Calamin is a basic zinc silicate containing $ zinc oxid, 25$ silica and $ water. The crystals are orthorhombic-hemimorphie, usually tabular parallel to the brachypinacoid (fig. 229) and are frequently joined in radiated groups forming a rounded notched ridge or cockscomb (pi. 32J. Granular, stalactitic and botryoidal masses are also found. The luster is vitreous to pearly. Isolated crys- tals are occasionally colorless and transparent; in general the color is white, more rarefy delicate shades of blue or green and yellow to brown in the massive varieties. Calamin usually accompanies smithsonite in veins and cavities in stratified calcareous rocks associated with the sulfids of zinc, iron and lead. It is mined in considerable amounts in Silesia and Rhenish Germany. In the United States it occurs extensively at Granby Mo.; also at Sterling Hill N. J., Bethlehem Pa. and in Virginia, Pennsylvania, Utah and Montana. As an ore of zinc it is valued as being comparatively free
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