Sanidine specimens for sale
3 for sale · $160–$3,000 USD
23 in the gallery
Sanidine is a high-temperature alkali feldspar mineral with the chemical formula KAlSi3O8. It occurs in monoclinic crystal habit and typically forms prismatic, tabular crystals, often with a glassy to pearly luster and a pale to amber color. As a member of the feldspar group, sanidine frequently coexists with other feldspars and silicate minerals in granitic pegmatites, rhyolites, and volcanic deposits. Fine specimens show clear or lightly tinted crystals that can be relatively large, and they may display zoning or twinning typical of feldspars. The mineral is most commonly associated with high-temperature environments where rapid crystallization occurs, providing collectors with distinctive, well-formed crystals from classic localities.
- Formula
- K(AlSi3O8)
- Rarity
- Common
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Feldspar group (framework silicate); Tectosilicate, Strunz 9.FA
Buy Sanidine specimens
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Where Sanidine is found
Top localities
- Betroka District5 specimens
- Analamanga2 specimens
- Haute Matsiatra2 specimens
- Anosy1 specimen
- Copper Falls Mine1 specimen
- Picherande1 specimen
- Tepetate1 specimen
- Topaz Mountain1 specimen
- Chalk Mountain1 specimen
About Sanidine
Notable specimens come from Madagascar, the USA, France, and Italy, where sanidine-bearing rocks yield clean crystals and striking crystal faces. Collectors value sanidine for its clarity, lustrous surfaces, and the vibrancy of color in certain samples, as well as its rarity in pristine, large crystals from ideal geologic settings. Although often overlooked in broader mineral catalogs, sanidine offers a straightforward aesthetic appeal and reliable crystallography for those assembling feldspar groups or pegmatite suites.