Jadeite and Wollastite Composition, Crystallization & Structure

Jadeite
A sodium-aluminum metasilicate, NaAl(SiO₃)₂. Massive, granular to closely compact H. = 6.5- 7. G. = 3.33-3.35. Vitreous luster. Color white, gray to light green. Translucent to opaque. Very tough. Fuses at 2.5, coloring the flame yellow (sodium). Forms in part the material known as jade and highly prized by oriental peoples as an ornamental material. Made into finely carved ornaments and utensils, and highly prized carved ornaments and utensils, and when of fine color and translucent commands a high price. Found chiefly in Upper Burma, in southern China and in Tibet.

Wollastite
Composition. Calcium metasilicate, CaSiO3 = Silica 51.7, lime 48.3.

Crystallization. Monocilinic. Usually in tabular crystals, with either base or orthopinacoid prominent.

Structure. Commonly massive, cleavable to fibrous; also compact.

Physical Properties. Perfect cleavage parallel to orthopinacoid. H. = 5-5.5. G. = 2.8-2.9. Vitreous luster, pearly on cleavage surfaces. Sometimes silky when fibrous. Colorless, white or gray. Translucent to opaque.

Tests. Fusible at 4 to a white, almost glassy globule. Decomposed by hydrochoric acid, with the separation of silica but without the formation of a jelly. Filtered solution with ammonium hydroxide and ammonium carbonate gives white precipitate of calcium carbonate.

Occurrence. Occurs chiefly as a contact, mineral in crystalline limestones, formed by the action of silicic acid on the limestone, commonly in the presence of mineralizers and at a comparatively low temperature. Associated with calcite, diopside, lime gamet, tremolite, lime feldspars, vesuvianite, epidote, etc. May at times be so plentiful as to constitute the chief mineral of the rock mass. Such wollastonite rocks are found in California, the Black Forest, Brittany, etc. The crystallized mineral is found at Csiklova in Rumania; at Vesuvius; from Chiapas, Mexico. At Diana, Lewis Co., and also in Orange and St Lawrence Counties, New York.

Resource Calculations Reserve Calculations using the Zone Method Danburite-Topaz Group – Danburite and Topaz Composition Mining equipment Western Australia Single-Roll Crushers REFERENCES. Surge Storage Capacity in Crushing Circuit Mill Configurations Table Reserve Calculations Allanite and Axinite Composition, Crystallization & Structure Wireline Drilling Derivation of a Chemical Formula from the Analysis of a Mineral Silver Composition, Crystallization, Structure and Occurrence OPEN SIDE DISCHARGE SETTING on Crusher Nordberg Omnicone Crushers: Hydraulic Control