RARE Cavansite Stilbite Crystal Cluster Mineral Specimen Poona India NR!

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I offer a shipping discount for customers who combine their payments for multiple purchases into one payment!The discount is regular shipping price for the first item and just 50 cents for each additional item! Please be sure to request a combined invoice before you make your payment. Thank you. Hi there. I am selling this really cute cavansite and stilbite mineral specimen. This piece is literally perfect. LOOK BELOW FOR LARGE PHOTO S This specimen weighs 1.20 carats which is 0.25 grams and measures 8 mm long by 7 mm wide by 6 mm tall. It is from Poona India , or it may be spelled Puna , India . If you have any questions, do not hesitate to ask me. Have fun bidding, thanks so much for visiting my auction and have a great day:>) The following is a wikipedia entry about cavansite:====================================================================================================================================Cavansite, whose name is derived from its chemical composition, calcium vanadium silicate, is a deep blue hydrous calcium vanadium phyllosilicate mineral, occurring as a secondary mineral in basaltic and andesitic rocks along with a variety of zeolite minerals. Discovered in 1967 in Malheur County, Oregon, cavansite is a relatively rare mineral. It is polymorphic with the even rarer mineral, pentagonite. It is most frequently found in Poona, India, in the Deccan Traps, a large igneous province.Contents * 1 Uses of cavansite * 2 Associated minerals * 3 Notes for identification * 4 References Uses of cavansiteWhile cavansite does contain vanadium, and could thus be a possible ore source for the element, it is not generally considered an ore mineral. However, because of its rich color and relative rarity, cavansite is a sought after collector's mineral. Associated minerals * Members of the apophyllite group * Members of the zeolite group, particularly stilbite. * babingtonite, Ca2Fe2Si5O14OH * quartz, SiO2 * calcite, CaCO3 * pentagonite, Ca(VO)Si4O10 · 4(H2O) Notes for identificationCavansite is a distinctive mineral. It tends to form crystal aggregates, generally in the form of balls, up to a couple centimeters in size. Sometimes the balls are coarse enough to allow the individual crystals to be seen. Rarely, cavansite forms bowtie shaped aggregates. The color of cavansite is distinctive, almost always a rich, bright blue. The color is the same as its dimorph, pentagonite, but the latter is generally much more spikey with bladed crystals. Finally, the associated minerals are useful for identification, as cavansite is frequently found sitting atop a matrix of zeolites or apophyllites. The following is a wikipedia entry about stilbite:==================================================================================================================================== Stilbite is a tectosilicate mineral of the zeolite group consisting of hydrated calcium aluminium silicate, NaCa2Al5Si13O36·14H2O.Usually a small proportion of the calcium is replaced by sodium. Crystals are monoclinic, and are commonly twinned, giving rise to complex groups and characteristic sheaf-like aggregates. The color is usually white, sometimes red, and on the perfect cleavage (parallel to the plane of symmetry) the lustre is markedly pearly; hence the name stilbite, from Greek, "to shine". After the separation of heulandite from this species in 1818, the name desmine ("a bundle") was proposed, and this name is now employed in Germany. The hardness is 3.5 - 4 and the specific gravity 2.2. The sievelike crystal structure of the zeolite stilbite enables it to separate hydrocarbons in the process of petroleum refining.Stilbite is a mineral of secondary origin, and occurs with other zeolites in the amygdaloidal cavities of basaltic volcanic rocks; it is sometimes found in granite and gneiss, and exceptionally in hydrothermal veins. It is abundant in the volcanic rocks of Iceland, Faroe Islands, Isle of Skye, Bay of Fundy, Nova Sc... read more

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