Cavansite Stilbite Matrix Crystal Cluster Minerals Specimen Rocks India Zeolite

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This specimen weighs 3.00 carats, which is 0.60 grams. It measures 10 mm x 9 mm x 9 mm.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!To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart.Auctions you win are added to your cart automatically.For any "buy it now" items or second chance offers, be sure to Once all of your items are in your cart just pay for them from your cart and the combined shipping discount should be applied automatically.I offer a money back guarantee on every item I sell.If you are not 100% happy with your purchase just send me a message to let me knowand I will buy back the item for your full purchase price.Hi there. I am selling this really cute cavansite and stilbite mineral specimen. This piece is literally perfect.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 From Wikipedia, the free encyclopedia Jump to: navigation , search Cavansite Cavansite: 2.8 cm cluster on zeolite matrix General Category Silicate mineral Formula(repeating unit) Ca ( V O ) Si 4 O 10 ·4( H 2 O ) Crystal symmetry Orthorhombic dipyramidal H-M Symbol 2/m 2/m 2/m Space group Pcnm Unit cell a = 9.792(2) Å, b = 13.644(3) Å, c = 9.629(2) Å; Z = 4 Identification Color Brilliant sky-blue to greenish blue Crystal habit Radiating acicular prismatic crystals commonly as spherulitic rosettes Crystal system Orthorhombic Cleavage Good on {010} Tenacity Brittle Mohs scale hardness 3 - 4 Luster Vitreous, pearly Streak Bluish-white Diaphaneity Transparent Specific gravity 2.25 - 2.33 Optical properties Biaxial (+) Refractive index n α = 1.542(2) n β = 1.544(2) n γ = 1.551(2) Birefringence δ = 0.009 Pleochroism Visible: X=Z= colorless Y= blue 2V angle Measured: 52° References [ 1 ] [ 2 ] [ 3 ]Cavansite , whose name is derived from its chemical composition, ca lcium van adium si lica te , 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 and in the Deccan Traps , a large igneous province .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 Cavansite on stilbite from the type locality Members of the apophyllite group Members of the zeolite group, particularly stilbite . babingtonite , Ca 2 Fe 2 Si 5 O 14 OH quartz , Si O 2 calcite , Ca CO 3 pentagonite, Ca ( V O ) Si 4 O 10 · 4( H 2 O ) Notes for identification Stalactitic cavansite, 3.6 x 2.1 x 1.8 cm, Wagholi , Pune District , Maharashtra , IndiaCavansite 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. read more

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