|Chemical name||Lead chromate|
|Colors||Red-orange, cherry red, orange, yellowish|
|Crystal habit||Crystals usually prismatic, striated lengthwise; also acicular, granular, columnar, incrusting, sometimes hollow|
|Cleavage||Distinct, one direction; poor in two other directions. Brittle|
|Fracture||Conchoidal, uneven; brittle and sectile|
|Luster||Adamantine to vitreous|
|Luminescence||Weak reddish to dark brown (SW); weaker effect in LW|
|Name origin||From the Greek krokos, meaning saffron, in allusion to the color|
|Optics||α = 2.29-2.31; β = 2.36; λ = 2.66. Biaxial (+), 2V = 57°|
|Pleochroism||Orange-red to blood red|
|Spectral||Distinct band at 5550 but seen only in thin fragments. Transmits mainly in the yellow-red region of the spectrum|
Secondary mineral in oxidized zones of lead deposits.
Dundas, Tasmania: best crystals found in the world, some gemmy; large clusters.
Beresov Dist., U.S.S.R.: red crystals.
Tiger, Arizona: very tiny crystals.
Minas Gerais, Brazil
Crocoite is one of the loveliest of all collector stones. It's too soft and brittle for wear, but it is quite a rare mineral and relatively few stones have been cut. The dispersion is high but completely masked by the intense body color.
Arem, p. 34
Chesterman, p. 470
- Arem, Joel E. Color Encyclopedia of Gemstones, Litton Educational Publishing, Inc.:New York (1977)
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)