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Id 97
Identification Type Mineral
Name Siderite
Distinguishing Features
Description Transparent pale green to orange-brown. Nonpleochroic. High-order birefringence. Moderate relief.

Form is somewhat diverse, due to varying means of formation. Common forms are elongate laths with squared off ends and parallel sides (easily distinguished from rice grain shaped aragonite and more rhombic calcite), twinned "bowtie" shapes of multiple laths, or granular rounded euhedra.

Requiring reduced iron, siderite, FeCO3, usually forms deep in the water column, when anoxic bottom waters mix with carbonate-rich surface waters, or diagenetically. Massive amounts of siderite may be precipitated rapidly, and may or may not be cemented with siderite or other phases.
Tags carbonate
green
brown
External Resources Siderite on MinDat
Imposters
Images
Unique Identification: Siderite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: twinned flared elongate
Image Tags: none
Unique Identification: Siderite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: twinned flared elongate
Image Tags: none