Henmilite specimens for sale
5 for sale · $744–$2,500 USD
3 in the gallery
Henmilite is a sulfate mineral defined by its BaCa(SO4)2 · 2H2O composition. It typically forms as delicate, colorless to pale yellow crystals with a transparent to translucent appearance and a vitreous to subadamantine luster that can wink with slight iridescence in bright light. Crystallization occurs in sulfate-rich environments, where barium and calcium balance with sulfate and water in its hydrated structure, yielding a mineral that often appears in small, well-formed crystals embedded in matrix.
- Formula
BaCa(SO₄)₂ · 2H₂O - Rarity
- Ultra Rare
- Stability
- Moderately Stable
- Collector interest
- Very High Interest
- Classification notes
- Borate; hydrated calcium copper hydroxyborate
Key characteristics
- Crystal system
- triclinic
- Mohs hardness
- 1.5
- Specific gravity
- 2.51
- Luster
- vitreous, pearly
- Transparency
- transparent, translucent
- Color
- blue, violet
- Streak
- white
- Cleavage
- perfect
- Fracture
- uneven
- Crystal habit
- tabular, prismatic, granular
- Micro-mount only
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Where Henmilite is found
About Henmilite
Notable specimens have been reported from Japan, where specific hydrothermal and sedimentary settings contribute to the mineral’s formation. Collectors prize Henmilite for its rarity and its clean, well-formed habit, which can display sharp faces and crisp terminations when recovered from appropriate host rocks. Although not among the most common sulfates, the mineral’s relatively simple composition paired with its hydration gives it a distinctive ghostly clarity that stands out on a cabinet shelf or within a mineral collection, especially when contrasted with more opaque sulfates.