An Introduction to the Study of Minerals, With a Guide to the Mineral Gallery
An Introduction to the Study of Minerals, With a Guide to the Mineral Gallery
British Museum (Natural History). Dept. of Mineralogy
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13. SULPHUB. 12. Blende. Each of the above orders is distinguished by a conibinatioii of eliaracters : thus, the characters of the order Babyte are Lustre: non-metallic. Streak : uncoloured or orange-yellow. Hardness : 2*5 to 5*0. Specific gravity : 3*3 to 7*3. Further, in this order, the characters are inter-related as follows : — 1. If the most distinct cleavage has only a single direction, the hardness does not lie between 4 and 5. 2. If the lustre is adamantine or imperfect-metallic, the sp...ecific gravity is not less than 5. 3. If the streak is orange-yellow, the specific gravity is at least 6. Digitized by Google 58 Mohs' scientific nomenclature. 4. If the hardness is 5, the specific gravity is under 4*5. 5. If the hardness is 5 and the specific gravity is under 4, the cleavage is diprismatic. The orders are, in turn, distributed into genera, the number of the latter in the order Babyte being six, termed re- spectively : — 1. Parachrose-baryte. 2. Zinc-baryte. 3. Scheelium-baryte.
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