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Feldspar (Group)
Feldspar (Group) is tectosilicate (feldspar group), KAlSi₃O₈ to NaAlSi₃O₈ to CaAl₂Si₂O₈. In the hand, it rates 6 to 6.5 on the Mohs scale, and it runs white and cream. Blocky pale mineral with two flat cleavage faces meeting near 90° that flash like tiny mirrors in the light.
The geology.
Feldspar (Group) carries the formula KAlSi₃O₈ to NaAlSi₃O₈ to CaAl₂Si₂O₈. It belongs to the monoclinic or triclinic system. Its listing category is tectosilicate (feldspar group).
It sits at 6 to 6.5 on the Mohs scale. The surface reads vitreous to pearly. Light behaviour is translucent to opaque. Specific gravity runs 2.55 to 2.76. The streak is white. It breaks with two perfect cleavages near 90°.
Blocky pale mineral with two flat cleavage faces meeting near 90° that flash like tiny mirrors in the light.
It turns up mostly as blocky crystals, cleavage chunks, rock components or tumbled.
The origins.
The most abundant mineral group in Earth's crust, about 60% of it; in nearly every granite and gneiss.
On value, the database notes: common and very affordable.
Traditional associations.
In energy work traditions, associated with self-discovery and support.
This is lore, and we label it as lore. The measurable facts are further up the page.
Spotting the real thing.
Blocky pale mineral with two flat cleavage faces meeting near 90° that flash like tiny mirrors in the light.
| Looks like | How to tell them apart |
|---|---|
| Quartz | Quartz is glassier, slightly harder, and never shows flat cleavage flashes |
| Calcite | Calcite is much softer and fizzes |
| Barite | Barite is far heavier |
At-home tests.
A loupe and a window seat settle most questions about feldspar (group). No workshop required.
| Test | What you should see |
|---|---|
| By eye | Right-angle cleavage flash |
| Scratch check | Scratches glass with effort (Mohs 6 to 6.5) |
| By eye | Salmon-pink blocky grains in granite are feldspar |
Anything that scratches, burns or dissolves the piece is a lab job. Get it appraised rather than testing it apart.
Care & handling.
At 6 to 6.5 on the Mohs scale it handles careful wear but scratches against quartz and dust. Store it separately and take rings off before rough work.
It breaks with two perfect cleavages near 90°, which is worth knowing before you set it or drop it.
Warm water and a soft cloth clean almost everything. Ultrasonic tanks, steamers and household cleaners are where pieces get ruined.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is KAlSi₃O₈ to NaAlSi₃O₈ to CaAl₂Si₂O₈. Crystal system: Monoclinic or triclinic. Specific gravity: 2.55 to 2.76. Streak: White. Cleavage and fracture: Two perfect cleavages near 90°.
How it reaches the market
The most abundant mineral group in Earth's crust, about 60% of it; in nearly every granite and gneiss.
What it gets confused with
Quartz: Quartz is glassier, slightly harder, and never shows flat cleavage flashes. Calcite: Calcite is much softer and fizzes. Barite: Barite is far heavier.
What it is worth
Common and very affordable.
One more thing
Moonstone, sunstone, labradorite, and amazonite are all just feldspars with special optical effects.
An education-first guide.
No product links here. We do not sell feldspar (group), and a guide that only covers our own shelves would not be much of a guide.
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