Sanidine

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6.0

Specific Gravity 2.54 – 2.61

Refractive Index 1.518 – 1.536

Crystal System Monoclinic

Luster Vitreous

Cleavage Good

Fracture Uneven,Conchoidal

Color various

Birefringence 0.005

Pleochroism Weak

Mohs Hardness

Mohs hardness of Sanidine shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Sanidine
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase	●
7	Quartz
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Sanidine

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

Treatments

Some sanidine subjected to iridation turns amber or smoky coloured. 6Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.54 to 2.61Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleMichael O?Donoghue, Gems, Sixth Edition (2006) GoodMichael O?Donoghue, Gems, Sixth Edition (2006) Excellent to good Uneven,ConchoidalMichael O?Donoghue, Gems, Sixth Edition (2006) 1.518 to 1.536Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Biaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 0.005 to 0.008Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references WeakMichael O?Donoghue, Gems, Sixth Edition (2006) WeakMichael O?Donoghue, Gems, Sixth Edition (2006) Light gray to light brownish varietyHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Transparent,TranslucentMichael O?Donoghue, Gems, Sixth Edition (2006) VitreousMichael O?Donoghue, Gems, Sixth Edition (2006) Weak reddish orange under both LWUV and SWUV (Madagascar)Michael O?Donoghue, Gems, Sixth Edition (2006) MonoclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references A flattened crystalMichael O?Donoghue, Gems, Sixth Edition (2006) Sanidine is a common constituent in acid and intermediate volcanic rocks such as rhyolites, dacites and trachytes; where the rock cooled quickly at above approximately 900�C, sanidine is the stable structureMichael O?Donoghue, Gems, Sixth Edition (2006) Sanidine information at mindat.org Madagascar  Myanmar  Ted Themelis (2008) Gems & mines of Mogok Ted Themelis (2008) Gems & mines of Mogok Ted Themelis (2008) Gems & mines of Mogok Sri Lanka 

About Sanidine

サニディンは高温型のカリウム長石で、通常は無色から淡いクリーム色または灰色のガラス質結晶を形成し、月長石に似た青みがかったアデュラレッセンスを示すことがあります。流紋岩や粗面岩などの火山岩・浅成岩中に産出し、ドイツのアイフェル地方では宝石品質の結晶が知られています。透明度の高さと光学的効果により、鉱物・宝石コレクションの興味深い一石となっています。

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