Images
Formula: MoO3.2H2O
Hydrated simple oxide of molybdenum
Crystal System: Monoclinic
Specific gravity: 3.12 measured, 3.11 calculated
Hardness: 2½
Streak: Pale yellow
Colour: Canary-yellow
Environments
Localities
At the type locality, Lake Como, San Juan County, Colorado, USA, sidwillite is found as bright yellow,
resinous, tabular crystals up to 0.2 mm in length. It occurs as an oxidation product of
jordisite in a quartz vein
and is associated with pyrite
(AM 71.1546).
Back to Minerals