Zoisite : CSIRO Spectroscopy Database

Zoisite [ Ca₂Al₃[Si₂O₇][SiO₄]O(OH) ]

Images of Zoisite

Zoisite specimens from Tanzania

Photo by Greg Polley, via Smithsonian National Museum of Natural History

CL spectrum of Zoisite from Cox's Bazar, Bangladesh

(C) 2023 CSIRO Mineral Resources

Photograph of a tanzanite (NMNH G4876) from the National Gem Collection that displays blue-to-purple pleochroism. In this photo, the crystal is blue but the reflection is purple.

Photo by Chip Clark, Smithsonian Institution. Public Domain.

Material properties

Formula	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)
Abbreviation	Zo
IMA Status	Grandfathered (pre-IMA), 1805
Crystal symmetry	Orthorhombic, Point group mmm, Space group Pnma (#62)
Classifications	Minerals containing SiO4, Minerals containing OH, Epidote (group)
Member	Thulite
Variant	Tanzanite
Related materials	Clinozoisite
Luminescence emitters	Eu, Tb, V
Spectra	Luminescence (1)
Search other databases	webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags	Aluminosilicate, Hydroxide, Mineral

Composition

Element	Atoms
H	1
Si	3
Al	3
Ca	2
O	13
Total:	22

References for Zoisite

Gaft et al. 1998

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0

Torpy et al. 2020

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2

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CSIRO spectra 2015 (Cox's Bazar)

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1

Specimens of Zoisite

Name	Owner	Materials	Image	Spectra	Techniques
G 4876 00 Zoisite (var. tanzanite)	Smithsonian Institution	Zoisite (var. Tanzanite)	G 4876 00 Zoisite (var. tanzanite) Photograph of a tanzanite (NMNH G4876) from the National Gem Collection that displays blue-to-purple pleochroism. In this photo, the crystal is blue but the reflection is purple. Photo by Chip Clark, Smithsonian Institution. Public Domain.	0	—
Tista 2020 D4 Shaker	CSIRO	Albite, Allanite-(Ce), Amphibole, Andesine, Apatite, Augite, Biotite, Bytownite, Chlorite (var. Mg, Fe), Epidote, Garnet, Grossular, Ilmenite, Ilmenite (var. Mn), K feldspar, Kyanite, Monazite-(Ce), Muscovite, Oligoclase, Pyroxene, Quartz, Staurolite, Titanite, Titanohematite, Xenotime-(Y), Zircon, Zoisite	Tista 2020 D4 Shaker Clustered phase map of river sands (D4 shaker), from the Tista River, Bangladesh. From Torpy et al. 2020 (C) 2020 CSIRO Mineral Resources	46	CL, EDS
Tista 2020 D4 Zircon conc	CSIRO	Albite, Apatite, Biotite, Florencite-(Ce), Ilmenite, K feldspar, Kyanite, Monazite-(Ce), Muscovite, Plagioclase, Quartz, Rutile, Scheelite, Titanite, Zircon, Zoisite	Tista 2020 D4 Zircon conc Image of a specimen of Zircon from Tista River, Bangladesh (C) 2020 CSIRO Mineral Resources	27	CL, EDS