Autunite (hydrated calcium uranyl phosphate), with formula Ca(UO 2) 2 (PO 4) 2 ·10–12H 2 O, is a yellow-greenish fluorescent phosphate mineral with a hardness of 2– 2 + 1 ⁄ 2. [4] [5] Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals, commonly in small crusts or in fan-like

Autunite Group. A secondary mineral resulting from the oxidation of primary uranium minerals in hydrothermal veins, granite pegmatites, etc. Dehydrates (reversibly) in air to meta-autunite.

Autunite is a hydrated calcium uranyl phosphate mineral with the chemical formula Ca(UO₂)₂(PO₄)₂·10–12H₂O. Autunite is a product of the alteration of uraninite. It is the most common surface uranium mineral, abundant in the oxidation zones of uranium deposits ; it is also found more rarely in pegmatitic veins containing uranium and ...

autunite, phosphate mineral, hydrated calcium and uranium phosphate [Ca(UO 2) 2 (PO 4) 2 ·10–12H 2 O], that is an ore of uranium. It forms translucent to transparent, yellow to pale-green crystals, scaly masses, or crusts in hydrothermal veins and pegmatites, where it occurs as an alteration product of uraninite.

A group of layer-structured uranyl phosphates and arsenates. Slightly more hydrated versions of the minerals in the Meta-autunite Group. ...

2023年4月23日 · Autunite is a phosphate mineral that formula is calcium uranium phosphate (Ca (UO2)2(PO4)2·10–12H2O) and It is harness of 2 – 2, 5.A popular collector’s mineral. Greenish or lemon yellow in color, autunite specimens fluoresce green under ultraviolet light.

Autunite Meta-autunite. Comments: Corner of a meta-autunite crystal showing the dehydration of autunite (dark green) to meta-autunite (lighter yellowish green).. Location: Daybreak Mine, Spokane County, Washington, U.S.A.. Scale: See Image. © Paul M. Schumacher

Mineral Group: Autunite group. Occurrence: A secondary mineral derived from primary uranium-bearing minerals under oxidizing conditions, in hydrothermal veins, granite pegmatites, etc. Association: Meta-autunite, torbernite, phosphuranylite, sal´eeite, uranophane, uranophane-beta, …

Autunite is a greenish yellow fluorescent mineral. The crystals of this mineral often occur in tabular square form as it has a tetragonal crystal system. The uranium content causes this ore to have radioactive properties.

Autunite. Autunite is a radioactive orthorhombic mineral which results from the hydrothermal alteration of uranium minerals. Used as a uranium ore, it was first discovered in France in 1852.