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Mineralpedia Details for Sanidine

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Sanidine

Sanidine

Formula
K(AlSi3)O8 
Crystal System
Monoclinic 
Crystal Habit
Blocky, Prismatic, Massive - Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous - Pearly 
Color
colorless, white, gray, yellowish white, reddish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
WebMineral
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Mindat
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Sanidine from Itrongay, Betroka dist., Anosy, Toliara, Madagascar

Sanidine
            from Itrongay, Betroka dist., Anosy, Toliara, Madagascar

Light yellow gemmy cleaved piece of Sanidine. This is one of the few localities where you would find an occurence of gemmy Sanidine, a feldspar found in volcanic deposits.

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Sanidine from Riedener Berg, Volkesfield, Eifel, Rheinland-Pfalz, German

Sanidine
            from Riedener Berg, Volkesfield, Eifel, Rheinland-Pfalz, German
Special Info
XRD Confirmed,EDS Confirmed

Translucent gemmy mass. Verified by Dr. Igor Pekov.

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Sanidine from Penticton, Osoyoos dist., British Columbia, Canada

Sanidine
            from Penticton, Osoyoos dist., British Columbia, Canada

Large tabular dull Sanidine crystal showing Carlsbad twinning.

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Sanidine from Ariccia, Alban Hills, Rome Prov., Latium, Italy

Sanidine
            from Ariccia, Alban Hills, Rome Prov., Latium, Italy

Colorless and glassy nice crystals of Sanidine, a K-spar, which forms at high temperatures in potash-rich acid volcanics. These crystals are about 1-5mm.

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