Description: This specimen weighs 2.61 grams. It measures 23 mm x 10 mm x 8 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 click the "add to cart" button, NOT the "buy it now" button. 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 know and I will buy back the item for your full purchase price. Hi there. I am selling this beautiful danburite crystal mineral specimen! This specimen comes from Aurora Mine near Charcas, San Luis Potosi, Mexico. If you have any questions, do not hesitate to ask me. Have fun bidding, thanks so much for visiting my store and have a great day! Danburite ArticleTalkReadEditView history ToolsFrom Wikipedia, the free encyclopediaDanburite Cluster of creamy crystals of danburiteGeneralCategoryTectosilicatesFormula(repeating unit)CaB2(SiO4)2IMA symbolDbu[1]Strunz classification9.FA.65Dana classification56.3.1.1Crystal systemOrthorhombicCrystal classDipyramidal (mmm)H-M symbol: (2/m 2/m 2/m)Space groupPnamUnit cella = 8.038(3), b = 8.752(5)c = 7.73 [Å]; Z = 4IdentificationColourColourless, white, gray, brownish white, straw yellowCrystal habitEuhedral prismatic crystals; disseminated massesCleavage{001} PoorFractureSubconchoidal to unevenTenacityBrittleMohs scale hardness7 – 7.5LustreVitreous to greasyStreakWhiteDiaphaneityTransparent to translucentSpecific gravity2.93 – 3.02Optical propertiesBiaxial (+/-)Refractive indexnα = 1.627 – 1.633 nβ = 1.630 – 1.636 nγ = 1.633 – 1.639Birefringenceδ = 0.0062V angle88 to 90° measuredDispersionr < v strongUltraviolet fluorescenceFluorescent and thermoluminescent (red); Short UV=violet blue; Long UV=blue to blue-greenReferences[2][3][4]Danburite is a calcium boron silicate mineral with a chemical formula of CaB2(SiO4)2.[5] It has a Mohs hardness of 7 to 7.5 and a specific gravity of 3.0.[5] The mineral has an orthorhombic crystal form.[5] It is usually colourless, like quartz, but can also be either pale yellow[5] or yellowish-brown. It typically occurs in contact metamorphic rocks. The Dana classification of minerals categorizes danburite as a sorosilicate, while the Strunz classification scheme lists it as a tectosilicate;[4] its structure can be interpreted as either. Its crystal symmetry and form are similar to topaz; however, topaz is a calcium fluorine bearing nesosilicate. The clarity, resilience, and strong dispersion of danburite make it valuable as cut stones for jewelry. It is named for Danbury, Connecticut, United States, where it was first discovered in 1839 by Charles Upham Shephard.[5]
Price: 15.99 USD
Location: Tucson, Arizona
End Time: 2024-11-14T03:00:56.000Z
Shipping Cost: 5.95 USD
Product Images
Item Specifics
Restocking Fee: No
Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money back or replacement (buyer's choice)
Type: Danburite
Size: 23 mm x 10 mm x 8 mm
Country/Region of Manufacture: Mexico
Weight: 2.61 grams
Modified Item: No
