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Inorganics

Id Identification Type Name Description Distinguishing Features Tags
59 Mineral Vivianite Blue in both plane and cross-polarized light. May occur in diagenetic sprays, euhedra, nodules, and coatings. Low birefringence. In core face, chalky white when reduced; bright blue when oxidized. Associated with organic matter, bones, teeth, seeds, and other environments with available phosphate and reduced iron. Commonly found in lacustrine and estuarine sediments. Not common in marine sediments. Blue
Pleochroic
phosphate
transparent
diagenetic
ferrous
27 Mineral Volcanic Glass Transparent colorless to pale gray, green, or brown. Nonpleochroic. Isotropy is diagnostic feature, although devitrification may cause low-order birefringence at edges of grains. Moderate relief. May have bubble or pipe vesicles, stretching textures, cuspate to lunate bubble wall shards with sharp edges. May be disseminated throughout other sediment or occur in pure layers. Tephra may also contain crystalline grains from the same eruption or reworked material. Isotropic
Vesicular
bubbles
shards
sharp
ash
9 Mineral Volcanic Spherule