0.73 ct Significant Pear Cut (6 x 6 mm) Pakistan Green Sphene Natural Gemstone

Description: 0.73 ct Significant Pear Cut (6 x 6 mm) Pakistan Green Sphene Natural Gemstone Rare Stone! Unheated / Untreated Green Orgin From Pakistan 100% Natural Genuine Mined from Earth Gemstone!!! Gem Type Sphene Color Green Shape Pear Size (LxWxD)6.01 x 5.66 x 3.17 mm Weight 0.73 ct Grade AAA Hardness 5.0 Luster Excellent Clarity VS Treatment Unheated / Untreated Origin Pakistan RefractiveIndex 1.84-2.03 Specific Gravity 3.53 FL IF VVS1 VVS2 VS1 VS2 SI1 SI2 L1 L2 L3 L4 Flawless Internally Flawless Very Very Slightly Imperfect Very Slightly Imperfect Slightly Imperfect Imperfect Opaque Sphene Mohs Hardness - 5 Found in - Russia & Pakistan Titanite, or sphene (from the Greek sphenos, meaning wedge), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium. The International Mineralogical Association Commission on New Minerals and Mineral Names (CNMMN) adopted the name titanite and 'discredited' the name sphene as of 1982, although commonly papers and books initially identify the mineral using both names. Sphene was the most commonly used name until the IMA decision, although both were well known. Some authorities think it is less confusing as the word is used to describe any chemical or crystal with oxidized titanium such as the rare earth titanate pyrochlores series and many of the minerals with the perovskite structure. The name sphene continues to be publishable in peer-reviewed scientific literature, e.g. a paper by Hayden et al. was published in early 2008 in the journal Contributions to Mineralogy and Petrology. Sphene persists as the informal name for titanite gemstones. Track Page Views WithAuctiva's FREE Counter

Price: 9.74 USD

Location: Memphis, Tennessee

End Time: 2025-01-27T08:04:51.000Z

Shipping Cost: 5.99 USD