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Inorganics

Id Identification Type Name Description Distinguishing Features Tags
60 Mineral Rhodochrosite Greenish-brown in plane light. Strongly pleochroic. High birefringence. Ellipsoidal; may be difficult to distinguish in smear slide from siderite or dolomite. Forms in environments with reduced Mn. Occurs in lakes and estuaries, but uncommon; rare to absent in marine settings. Brown-green
High-birefringence
120 Mineral Rutile Transparent gray-green. Nonpleochroic. Strong second-order birefringence with vivid colors. High relief.

Usually detrital, but in rare cases may form diagenetically (M. Talbot, pers. comm). May appear as multiple contact twins.
high-relief
transparent
twinned
heavy-mineral