Vanadite and Amblygonite Composition, Crystallization & Structure
Composition. Pb4(PbCl)(VO4)3 = Vanadium pentoxide 19.4, lead protoxide 78.7, chlorine 2.5. Phosphorus and arsenic some times present in small amount replacing vanadium. In the variety endlichite the proportion of V2O5toAs2O5 is nearly the pyramid of the third order. In rounded crystals; sometimes cavernous.
Structure. In crystals and globular form. As incrustations.
Physical Properties. H. = 3. G. = 6.9-7.1. Adamantine to resinous luster. Color ruby- red, brown, yellow. Transparent to opaque.
Test. Easily fusible (1.5). Gives globule of lead on charcoal when fused with sodium carbonate. Gives an amber color in O. F. To salt of phosphorus bead (vanadium). Dilute nitric acid solution gives with silver nitrate a white precipitate of silver chloride. Endlichite would give in C. T. the reaction for arsenic (see under mimetite).
Occurrence. A rare mineral of secondary origin found in the upper oxidized portion of lead veins. Occurs in various districts in Arizona and New Mexico. Found is unusual crystals near Oudjda, Morocco.
Use. Source of vanadium and minor ore lead. Vanadium is obtained chiefly from other ores, such as the sulphide, patronite; the vanadite, carnotite; and a vanadium mica, roscoelite. Vanadium is used chiefly as a steel hardening metal. Metavanadic acid, HVO3, is used as a yellow pigment, kown as vanadium oxide is used as mordant in dyeing.
Amblygonite
A phosphate of lithium and aluminum, Li(AlF)PO4, having hydroxyl isomorphous with fluorine and often sodium in small amount replacing the lithium. Tricline. Usually massive, cleavage to compact. Perfect basal H. = 6. G.=3.08.
Luster vitreous, pearly on cleavage face. Color white to pale green or blue. Translucent. Easily fusible (2) giving a red flame (lithium). Insoluble in acids. After fusion with sodium carbonate and dissolving nitric acid, solution with excess of ammonium molybdate solution gives yellow precipitate (test for phosphate). A rare mineral found in pegmatite veins with tuomaline, lepidolite, apatite, etc. Found at Monterbras, France; Hebron, Paris, Auburn, and Peru, Maine; pala, California.
Understanding of the Bond Equation & The Terms Work Index. Effect of Feed Size on HammerMill Capacity Volcanic, Fine-Grained, Igneous Rocks Roll Crusher Plan Sizing and Selecting Shovel and Crusher Sizes Assaying Primary Crushing Ratio of Reduction Various Crusher Types & Differences Monoclinic System, Crystallographic Axes Blake crusher designed with a vertical stationary jaw Arsenic Composition, Crystallization, Structure and Occurrence Deposits of Diamond Pipes Stoping Methods Sampling a Ore Deposit
