Rock Salt
Rock Salt is the sedimentary rock form of halite, commonly appearing as clear, white, pink, orange, or gray crystalline salt.
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Rock Salt properties at a glance
| Type | Sedimentary Rocks |
|---|---|
| Chemical formula | NaCl |
| Mohs hardness | 2.5 |
| Luster | vitreous |
| Streak | White |
| Cleavage | Variable by mineral grains |
| Fracture | Conchoidal to uneven |
| Specific gravity | 2.17 |
| Transparency | opaque |
| Common colors | Clear, White, Pink, Orange, Gray |
| Rarity | common |
Geology & background
Forms when saline water evaporates and halite crystallizes into bedded salt deposits.
Rock salt deposits have been mined for food preservation, trade, industry, and road deicing for centuries.
How to identify Rock Salt
- Look for clear, white, pink, orange, or gray crystalline masses.
- Rock salt is soft and water-soluble.
- Cubic cleavage or blocky crystal surfaces may be visible.
- Do not taste unknown specimens; rely on safer visual and provenance clues.
Where Rock Salt is found
Rock Salt occurs in many sedimentary settings worldwide; exact locality should be verified from field notes, maps, or specimen provenance.
How much is Rock Salt worth?
| Entry-level specimen | $1 |
|---|---|
| Typical collector specimen | $10 |
| Premium specimen | $75+ |
Rock Salt is usually valued for teaching, field context, locality, texture, fossils, color, or unusual structures rather than high gem value.
Common uses
- Salt production
- Education
- Field identification
- Industrial uses
- Deicing
Interesting facts
- Rock salt is also called halitite.
- It can dissolve readily in water and should be kept dry.
- Color often comes from impurities, fluid inclusions, or tiny mineral particles.
Care & safety
Rock salt is soft and dissolves in water, so humidity and water exposure can damage it.
Avoid inhaling dust. Do not cut, grind, or polish unknown sedimentary rocks without eye protection and a properly rated respirator.
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