Epidote : CSIRO Spectroscopy Database

Epidote [ Ca₂(Al₂Fe^III)[Si₂O₇][SiO₄]O(OH) ]

Images of Epidote

CL spectrum of Epidote from Cox's Bazar, Bangladesh

OpticalFit spectrum plot by A. Torpy. (C) 2023 CSIRO Mineral Resources

Epidote crystals from Katsna Yama, Middle Urals, Russia. Field of view: 4.4mm

Photo by Masha Milshina (via Wikimedia Commons), CC-BY 4.0

Material properties

Formula	Ca₂(Al₂Fe^III)[Si₂O₇][SiO₄]O(OH)
Abbreviation	Ep
Classifications	Minerals containing SiO4, Epidote (group)
Member	Allanite-Epidote
Luminescence emitters	M2OH, M[n]OH
Spectra	Luminescence (1), Reflectance (2)
IMA Status	Grandfathered (pre-IMA), 1801
Search other databases	webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags	Mineral, Aluminosilicate

Composition

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

References for Epidote

Laukamp et al. 2021

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Pejcic et al. 2022 (EP2022-5804)

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Pejcic et al. 2021 (EP2021-1148)

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Rahman et al. 2020

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1

Torpy et al. 2020

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1

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Specimens of Epidote

Name	Owner	Materials	Phase purity	Image	Spectra	Techniques
MES110 Epidote	CSIRO	Epidote (99.5%)	99.5	MES110 Epidote Image of Epidote [ Ca2(Al2Fe3+)[Si2O7][SiO4]O(OH) ] in specimen 'MES110 Epidote' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
MT8330 Epidote	CSIRO	Clinochlore, Fe, Epidote (91.5%), Quartz, Titanite	91.5	MT8330 Epidote Image of Epidote, Clinochlore (var. Fe), Quartz and Titanite in specimen 'MT8330 Epidote' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
MCU_EPI_1 Epidote	CSIRO	Albite, Clinochlore, Fe, Epidote (81.3%), Magnetite, Quartz	81.3	MCU_EPI_1 Epidote Image of Epidote, Albite, Clinochlore (var. Fe), Magnetite and Quartz in specimen 'MCU_EPI_1 Epidote' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	2	Reflectance
M1385 Augite / Epidote	CSIRO	Albite, Augite, Epidote (41.5%), Fluorapatite	41.5	M1385 Augite / Epidote Image of Augite, Albite, Epidote and Fluorapatite in specimen 'M1385 Augite / Epidote' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
MES082 Omphacite / Ferro-glaucophane / Epidote	CSIRO	Actinolite, Albite, Calcite, Epidote (12.0%), Ferro-glaucophane, Majorite, Omphacite, Quartz, Titanite	12.0	MES082 Omphacite / Ferro-glaucophane / Epidote Image of Omphacite, Actinolite, Albite, Calcite, Epidote, Ferro-glaucophane, Majorite, Quartz and Titanite in specimen 'MES082 Omphacite / Ferro-glaucophane / Epidote' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
Tista 2020 D4 Shaker	CSIRO	Albite, Allanite-(Ce), Amphibole, Andesine, Apatite, Augite, Biotite, Bytownite, Chlorite, Mg, Fe, Epidote, Garnet, Grossular, Ilmenite, Ilmenite, 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