Faujasite-Ca is a rare member of the zeolite group often occurring as sharp, well-defined octahedral crystals in volcanic cavities. It is best known for its complex framework structure and is primarily prized by advanced mineral collectors. While it can occur in a few classic European and Canadian localities, it remains a challenging find for field collectors.
Is this faujasite-ca?
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 faujasite-ca with a known reference. Faujasite-Ca sits at Mohs 5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Faujasite-Ca leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Faujasite-Ca typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: colorless, white, yellowish.
- 5Look at form & habitCrystal system: cubic. Typical habit: octahedral crystals.
Often confused with
Faujasite-Ca vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside faujasite-ca
Minerals reported to co-occur with faujasite-ca. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Ca,Na₂,Mg)₃₅Al₇₀Si₁₂₂O₃₈₄·235H₂O
- Mohs hardness
- 5
- Density
- 1.92 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Cubic
- Crystal habit
- Octahedral Crystals
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Volcanic Rocks
- Typical price
- $20-150 thumbnail
Where rockhounds find faujasite-ca
Classic worldwide localities
- Kaiserstuhl, Germany
- Sasbach, Germany
- Mont Saint-Hilaire, Canada
Field-hunting tip
Look in volcanic rocks country — that is the host setting where faujasite-ca typically forms. If you start seeing augite, nepheline, calcite in float, you are in the right ground. Field specimens usually show a octahedral crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find faujasite-ca on the map
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