These two images
of the same specimen are of the Arizona Mineral and Mining Museum specimen
number MMT 312. It is from Dundas Tasmania, Australia.
CHEMISTRY - Pb(CrO4)
CRYSTALLOGRAPHY - Monoclinic
CRYSTAL GROWTH AND HABITS - Crystals of Crocoite are most commonly long prismatic. Faces are typically very smooth. Crystals are also commonly hollow. It can also be massive to granular.
COLOR AND OPTICAL PROPERTIES - Color varies from red to deep orange-red, orange and yellow; Transparent to translucent.
HARDNESS - 2.5 - 3
SPECIFIC GRAVITY - 5.9 - 6.0
LUSTER - Vitreous to adamantine
STREAK - Orange to yellow
BREAKABILITY - Distinct cleavage along {110} with sub conchoidal to uneven fracture. Sectile.
OCCURRENCE - A secondary mineral found in altered, oxidized area of lead and chromium minerals.
ASSOCIATED MINERALS - Pyromorphite, Cerussite, Wulfenite, Vanadinite, Descloizite.
MINERAL NAME - From the Greek for saffron referring to its yellowish orange color.