Megakalsilite is a rare potassium aluminosilicate mineral belonging to the nepheline group. It is typically found in alkaline igneous environments as small, prismatic crystals, often closely associated with other feldspathoid minerals like kalsilite.
Is this megakalsilite?
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 megakalsilite with a known reference. Megakalsilite sits at Mohs 6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Megakalsilite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Megakalsilite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: colorless, white.
- 5Look at form & habitCrystal system: hexagonal. Typical habit: prismatic crystals.
Often confused with
Megakalsilite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside megakalsilite
Minerals reported to co-occur with megakalsilite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- KAlSiO₄
- Mohs hardness
- 6
- Density
- 2.63 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Hexagonal
- Crystal habit
- Prismatic Crystals
- Cleavage
- Distinct On {10-10}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Alkaline Igneous Rocks
- Typical price
- $50-300 per specimen
Where rockhounds find megakalsilite
Classic worldwide localities
- Khibiny Massif, Russia
- Mount Vesuvius, Italy
Field-hunting tip
Look in alkaline igneous rocks country — that is the host setting where megakalsilite typically forms. If you start seeing kalsilite, nepheline, leucite 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
How do you identify megakalsilite?+
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How much is megakalsilite worth?+
What rocks look like megakalsilite?+
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Find megakalsilite on the map
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