Tincalconite
A variety of Minerals
What is Tincalconite?
Tincalconite is a hydrous sodium borate mineral closely related to borax, and is a secondary mineral that forms as a dehydration product of borax. Its formula is Na2B4O7·5H2O or Na2[B4O5(OH)4]·3H2O. Tincalconite typically occurs as a fine grained white powder. It crystallizes in the hexagonal crystal system and has been found as primary euhedral di-rhombohedral, pseudo-octahedral crystals. It is also found pseudomorphically replacing borax crystals. It has a specific gravity of 1.88 and a Mohs hardness of 2. Refractive index values are nω=1.460 and nε=1.470. While most tincalconite is created by man through exposing borax to dry air, there are natural occurrences of tincalconite, as in Searles Lake, California where it was first described in 1878. In addition to several California and Nevada locations it is reported from Argentina, Italy, Turkey and Ukraine. The name comes from "tincal", Sanskrit for borax, and Greek, "konis", meaning powder, for its composition and typical powdery nature.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tincalconite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Tincalconite Localities Map
See where Tincalconite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- White, colourless (artificial material); colourless in transmitted light.
- Hardness (Mohs)
- 2
- Density
- 1.894 g/cm³
Chemical Properties
- Chemical Formula
- Na2(B4O7) · 5H2O
- Elements
- B, H, Na, O
Also Known As
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Tincalconite FAQs
How do I identify Tincalconite?
Tincalconite can be identified by its hardness of 2 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Tincalconite?
Tincalconite typically appears in White, colourless (artificial material); colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Tincalconite?
Tincalconite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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