M623 Hardness
2 to 2-1/2. Hydrous phosphate of calcium and uranium, often with some
barium and magnesium.
Beautiful lemon to sulfur-yellow green. Terragonal; usually thin
tubular crystals; also foliated, scaly micaceous aggregates. Rare.
Unusual. Beautiful specimens. The name is after the locality at Autun,
Saone-et-Loire, France. Autunite is an ore of uranium. From Mt. Spokan,
Washington.
Limited Quantity. Nice specimens.
Fluoresces: Bright Yellow
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