Valentinite is a high lustered, often fibrous oxide mineral. It forms
sprays of crystals that are usually matted to the host rock in radiating
clusters. Its adamantine (gem-like) to pearly luster serves to add a nice
quality to this uncommon antimony mineral.
Valentinite is dimorphous with the mineral senarmontite.
minerals have the exact same chemistry, but they have different structures.
Senarmontite is isometric
and valentinite is orthorhombic.
It is similar to the situation between diamond
Valentinite is associated with senarmontite as well as stibnite.
Actually this association is no surprise since both senarmontite and
valentinite are oxidation products of the antimony sulfide.
- Color is colorless, white, yellow, reddish or gray.
- Luster is adamantine or pearly.
- Transparency: Crystals are translucent to opaque in more massive
- Crystal System is orthorhombic.
- Crystal Habits include prismatic to fibrous and compact aggregates
forming tufts and radiating sprays. Also massive and granular. Individual
crystals are complexly faceted.
- Cleavage is perfect.
- Fracture is uneven.
- Hardness is 2.5 - 3.
- Specific Gravity is approximately 5.7 (heavier than average).
- Streak is white.
- Associated Minerals include quartz,
native antimony, senarmontite, kermesite, stibiconite and other
- Notable Occurrences include the Sensa Mine, Ain Beida, Qacentina
(Constantine), Algeria; Freiberg, Germany; Dauphine, France; Bolivia; Pribram,
Czech Republic; and Ham Sud Township, Wolfe County, Quebec, Canada.
- Best Field Indicators are crystal habit, high luster, associations
and specific gravity.