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Id	6
Identification Type	Mineral
Name	Iron Oxides, Opaque (e.g., magnetite)
Distinguishing Features
Description	Fully opaque where visible by light microscopy. In coarser, sorted lacustrine sediment, cubic, faceted, or irregularly blocky grains may occur in association with other high-density minerals. May be distinguished from pyrite and other sulfides by grey color under oblique reflected light. Biomineralized magnetite produced by magnetotactic bacteria is widespread in sedimentary environments, but normally in a sub-micron size class well below that of grains discerned in smear slides.
Tags	heavy-mineral
External Resources	magnetite titanomagnetite
Imposters
Images

	Unique Identification: Iron Oxides, Opaque (e.g., magnetite) Site name: Mountain Lake Light type: Plane-Polarized Light Magnification: 400 Submitted by: Val Stanley Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California). Image Tags: heavy-mineral rounded opaque-oxide magnetite
	Unique Identification: Iron Oxides, Opaque (e.g., magnetite) Site name: Mountain Lake Light type: Cross-Polarized Light Magnification: 400 Submitted by: Val Stanley Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California). Image Tags: heavy-mineral rounded opaque-oxide magnetite
	Unique Identification: Iron Oxides, Opaque (e.g., magnetite) Site name: Mountain Lake Light type: Plane-Polarized Light Magnification: 400 Submitted by: Val Stanley Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California). Image Tags: heavy-mineral rounded opaque-oxide magnetite
	Unique Identification: Iron Oxides, Opaque (e.g., magnetite) Site name: Mountain Lake Light type: Cross-Polarized Light Magnification: 400 Submitted by: Val Stanley Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California). Image Tags: heavy-mineral rounded opaque-oxide magnetite
	Unique Identification: Iron Oxides, Opaque (e.g., magnetite) Site name: not specified Light type: Plane-Polarized Light Magnification: 400 Submitted by: Jess Rodysill Notes: iron oxides replacing rim of calcite grain Image Tags: pseudomorphing
	Unique Identification: Iron Oxides, Opaque (e.g., magnetite) Site name: not specified Light type: Cross-Polarized Light Magnification: 400 Submitted by: Jess Rodysill Notes: iron oxides replacing rim of calcite grain Image Tags: pseudomorphing

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