$450Median
3Sold (12 mo)
$640Last sale
Hydroboracite specimens for sale
5 for sale · $450–$1,500 USD
19 in the gallery
Hydroboracite is a hydrated calcium-magnesium borate mineral that forms in low-temperature hydrothermal environments. It typically occurs as colorless to pale yellow crystals or as botryoidal and granular masses, often displaying a vitreous to resinous luster. The mineral’s habit can range from prismatic to bladed crystals, with clarity varying from transparent to translucent. Hydration of the mineral gives it a delicate appearance that is prized by collectors for its subtle coloration and unusual borate composition.
- Formula
- CaMg[B3O4(OH)3]2 · 3H2O
- Rarity
- Rare
- Stability
- Stable
- Collector interest
- High Interest
- Classification notes
- Borates; Strunz 6.BA
Buy Hydroboracite specimens
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About Hydroboracite
Notable specimens come from classic hydrothermal locales in Germany, the United States, and Kazakhstan, where hydroboracite is associated with other borate minerals and gangue minerals typical of low-temperature alteration zones. Specimens from these regions are sought after for their crystallographic forms and the context provided by associated minerals, which helps illuminate the mineral’s formation conditions. Collectors value hydroboracite for its rarity, its interesting chemical family, and the way it complements other borate assemblages in a cabinet of minerals.
