Bobjonesite is a rare vanadyl sulfate mineral known primarily from the Temple Mountain area in Utah. It typically forms as small, pale yellow prismatic crystals in association with gypsum and other secondary minerals in sedimentary environments.
Is this bobjonesite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch bobjonesite with a known reference. Bobjonesite sits at Mohs 2 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Bobjonesite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Bobjonesite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, pale yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: prismatic crystals.
Often found alongside bobjonesite
Minerals reported to co-occur with bobjonesite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- VOSO₄·3H₂O
- Mohs hardness
- 2
- Density
- 2.31 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Monoclinic
- Crystal habit
- Prismatic Crystals
- Cleavage
- Perfect
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Sedimentary Rocks
- Typical price
- $50-300 per specimen
Where rockhounds find bobjonesite
Classic worldwide localities
- Temple Mountain, Utah, USA
Field-hunting tip
Look in sedimentary rocks country — that is the host setting where bobjonesite typically forms. If you start seeing gypsum, stewartite in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find bobjonesite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
