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Id 37
Identification Type Mineral
Name Aragonite
Distinguishing Features Rice-shape
Acicular
Elongate
High-birefringence
Description Transparent colorless. Nonpleochroic. Extreme birefringence. Distinguished by small (~10 um) acicular (needle-like) or rice-like grain morphology. Moderate relief, varying by direction. Twinning may be common.

Organisms such as pteropods, most mollusks, and some corals produce biogenic aragonite.
Tags Carbonate
salt
transparent
colorless
External Resources Aragonite on MinDat
Imposters
Images
Unique Identification: Aragonite
Site name: Black Sea (43 00.29 N, 36 00.68 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: High power view of tritiform aragonite grains, resembling grains of rice or wheat, tritiform
Image Tags: none
Unique Identification: Aragonite
Site name: Black Sea (43 00.29 N, 36 00.68 E)
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: tritiform
Image Tags: none
Unique Identification: Aragonite
Site name: Black Sea (43 00.29 N, 36 00.68 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: High power view of tritiform aragonite grains, resembling grains of rice or wheat, tritiform
Image Tags: none
Unique Identification: Aragonite
Site name: Pyramid
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Joe Smoot
Notes: high relief, needles, broken diatoms
Image Tags: none
Unique Identification: Aragonite
Site name: Black Sea (42 05.94 N, 29 36.82 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of aragonite needles, acicular needles
Image Tags: none
Unique Identification: Aragonite
Site name: LacCore reference collection
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Val Stanley
Notes: acicular habit
Image Tags: none