Arsenopyrite : CSIRO Spectroscopy Database

Arsenopyrite [ FeAsS ]

Image of Arsenopyrite

Image of Arsenopyrite in specimen 'M 25917' (Museums Victoria) from Redruth, Cornwall, England

Photograph by Frank Coffa, Museums Victoria, CC-BY-4.0

Material properties

Formula	FeAsS
Abbreviation	Apy
IMA Status	Approved (IMA 1962 s.p.)
Crystal symmetry	Monoclinic, Point group 2/m, Space group P2₁/c (#14)
Classification	Arsenopyrite (group)
Search other databases	webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags	Mineral, Sulphide

Composition

Element	Atoms
S	1
As	1
Fe	1
Total:	3

Specimens of Arsenopyrite

Name	Owner	Materials	Phase purity	Image
M2296 Arsenopyrite	CSIRO	Arsenopyrite (100.0%)	100.0	M2296 Arsenopyrite Photograph of Arsenopyrite [ FeAsS ] in specimen 'M2296 Arsenopyrite' (CSIRO) (C) 2025 CSIRO Mineral Resources. All rights reserved.
M1821 Arsenopyrite	CSIRO	Arsenopyrite (91.3%), Quartz	91.3	M1821 Arsenopyrite Image of Arsenopyrite and Quartz in specimen 'M1821 Arsenopyrite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.
M2452 Arsenopyrite	CSIRO	Arsenopyrite (88.0%), Pyrite, Quartz	88.0	M2452 Arsenopyrite Image of Arsenopyrite, Pyrite and Quartz in specimen 'M2452 Arsenopyrite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.
M0414 Arsenopyrite	CSIRO	Arsenopyrite (72.8%), Calcite, Dolomite, Glaucodot	72.8	M0414 Arsenopyrite Image of Arsenopyrite, Calcite, Dolomite and Glaucodot in specimen 'M0414 Arsenopyrite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M2581 Arsenopyrite	CSIRO	Arsenopyrite (51.0%), Dolomite, Muscovite-1M, Pyrite, Quartz, Siderite	51.0	M2581 Arsenopyrite Image of Arsenopyrite with Dolomite, Muscovite, Pyrite, Quartz and Siderite in specimen 'M2581 Arsenopyrite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M0204 Arsenopyrite	CSIRO	Arsenopyrite (42.4%), Galena, Löllingite, Quartz, Sphalerite	42.4	M0204 Arsenopyrite Image of Quartz, Arsenopyrite, Galena, Löllingite and Sphalerite in specimen 'M0204 Arsenopyrite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.
M0401 Arsenopyrite / Siderite / Calcite	CSIRO	Anglesite, Arsenopyrite (39.3%), Bournonite, Calcite (var. Mg), Siderite	39.3	M0401 Arsenopyrite / Siderite / Calcite Image of Arsenopyrite, Anglesite, Bournonite, Calcite (var. Mg) and Siderite in specimen 'M0401 Arsenopyrite / Siderite / Calcite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M2780 Chalcopyrite	CSIRO	Arsenopyrite (26.0%), Chalcopyrite, Jarosite, Pyrite, Siderite	26.0	M2780 Chalcopyrite Image of Chalcopyrite, Arsenopyrite, Jarosite, Pyrite and Siderite in specimen 'M2780 Chalcopyrite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M0279 Arsenopyrite in Siderite	CSIRO	Arsenopyrite (13.4%), Quartz, Siderite	13.4	M0279 Arsenopyrite in Siderite Image of Siderite, Arsenopyrite and Quartz in specimen 'M0279 Arsenopyrite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.
M2096 Scheelite	CSIRO	Ankerite, Arsenopyrite (7.0%), Fluorapatite, Muscovite-2M1, Pyrite, Quartz, Scheelite	7.0	M2096 Scheelite Image of specimen 'M2096 Scheelite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M2687 Pyrrhotite	CSIRO	Arsenopyrite (6.1%), Calcite (var. Mg), Magnetite, Pyrrhotite, Pyrrhotite-4M, Pyrrhotite-5C, Sulfur, Szomolnokite	6.1	M2687 Pyrrhotite Image of specimen 'M2687 Pyrrhotite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.
M0367 Arsenopyrite in Quartz	CSIRO	Arsenopyrite (4.1%), Quartz	4.1	M0367 Arsenopyrite in Quartz Image of Quartz and Arsenopyrite in specimen 'M0367 Quartz' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.