Rogermitchellite is an extremely rare strontium-calcium silicate mineral found primarily within the alkaline igneous complex of Mont Saint-Hilaire. Collectors look for its characteristic clear to pale yellow hexagonal tabular crystals that grow in association with other rare-earth minerals. It is a prized addition for advanced mineral collections specializing in Canadian pegmatites.
Is this rogermitchellite?
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 rogermitchellite with a known reference. Rogermitchellite sits at Mohs 3.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Rogermitchellite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Rogermitchellite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: colorless, white, pale yellow.
- 5Look at form & habitCrystal system: hexagonal. Typical habit: tabular crystals.
Often confused with
Rogermitchellite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside rogermitchellite
Minerals reported to co-occur with rogermitchellite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Sr₁₅Ca₄Si₁₄O₄₄(OH,F)₈
- Mohs hardness
- 3.5
- Density
- 2.71 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Hexagonal
- Crystal habit
- Tabular Crystals
- Cleavage
- Perfect
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Nepheline Syenite Pegmatites
- Typical price
- $50-300 per specimen
Where rockhounds find rogermitchellite
Classic worldwide localities
- Mont Saint-Hilaire, Quebec, Canada
Field-hunting tip
Look in nepheline syenite pegmatites country — that is the host setting where rogermitchellite typically forms. If you start seeing analcime, natrolite, sodalite in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify rogermitchellite?+
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What rocks look like rogermitchellite?+
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Find rogermitchellite on the map
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