$75Median
9Sold (12 mo)
$75Last sale
Colemanite specimens for sale
5 for sale · $80–$300 USD
70 in the gallery
Colemanite is a hydrated calcium borate mineral that typically forms as colorless to pale crystals with a vitreous to subadamantine luster. It often occurs in soft, tabular crystals or granular masses, and can display a translucent to near-transparent appearance when well-formed. The mineral is commonly associated with evaporite environments and is frequently found in borate-rich deposits, including reduced or alkaline settings that favor boron-bearing minerals. Notable specimens have been recovered from localities in Turkey and the United States, where Colemanite can appear in sizeable crystals or compact aggregates that reflect light well and show clean, glassy faces.
- Formula
- Ca[B3O4(OH)3] · H2O
- Rarity
- Common
- Stability
- Moderately Stable
- Collector interest
- Moderate Interest
Buy Colemanite specimens
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About Colemanite
Collectors prize Colemanite for its delicate hue and the way crystals sometimes form striking, elongated prisms or prismatic stacks. Its occurrence alongside other borates can produce visually appealing combinations, and the mineral’s relatively soft, easy cleavage adds to its display appeal when safely prepared. While not among the hardest minerals, Colemanite’s rarity in certain localities and its bright, glassy appearance make it a sought-after piece for garnet-like collections or evaporite-themed displays.
