Sanidine : CSIRO Spectroscopy Database

Sanidine [ (K,Na)(Si,Al)₄O₈ ]

Image of Sanidine

Sanidine specimen from Itrongay, Mahasoa East Commune, Betroka District, Anosy Region, Tuléar Province, Madagascar. Size: 2.5 x 1.9 x 1.0 cm, 47.09 ct.

Rob Lavinsky, iRocks.com – CC-BY-SA-3.0

Material properties

Formula	(K,Na)(Si,Al)₄O₈
Abbreviation	Sa
Variant	high
Classification	Alkali feldspar
Luminescence emitters	Fe, Mn, Pb, Unspecified
IMA Status	Grandfathered (pre-IMA), 1808
Search other databases	webmineral.com, mindat.org, rruf.info, fluomin.org, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Crystal symmetry	Monoclinic
Tags	Mineral, Aluminosilicate, Aluminosilicate

Composition

Element	Atoms
O	8
Al	1
Si	3
K	0.75
Na	0.25
Total:	13

Reference for Sanidine

Tarashchan 1978

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Specimens of Sanidine

Name	Owner	Materials	Phase purity	Image
M2362 Microcline / Sanidine / Albite	CSIRO	Albite, Ca, Albite, Ferro-ferri-hornblende, Microcline, Muscovite-1M, Mg, Sanidine, high (20.0%)	20.0	M2362 Microcline / Sanidine / Albite Image of Microcline, Albite, Albite (var. Ca), Ferro-ferri-hornblende, Muscovite-1M (var. Mg) and Sanidine (var. high) in specimen 'M2362 Microcline / Sanidine / Albite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M0834 Albite / Augite / Sanidine	CSIRO	Albite, Ca, Ankerite, Augite, Forsterite, Fe, Ilmenite, Montmorillonite, Sanidine (13.9%)	13.9	M0834 Albite / Augite / Sanidine Image of Albite (var. Ca), Ankerite, Augite, Forsterite (var. Fe), Ilmenite, Montmorillonite and Sanidine in specimen 'M0834 Albite / Augite / Sanidine' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.