$90Median
13Sold (12 mo)
$90Last sale
Harmotome specimens for sale
10 for sale · $150–$1,500 USD
32 in the gallery
Harmotome is a hydrated barium silicate mineral that forms colorless to pale yellow to brownish crystals in platy to tabular habits. It often exhibits a vitreous to resinous lustre and can occur as compact aggregates or thin, delicate crystals within silicate-rich rocks and secondary vein fills. Its appearance, including transparent to translucent crystals and distinctive tabular forms, makes it recognizable to collectors.
- Formula
- Ba2(Si12Al4)O32 · 12H2O
- Rarity
- Uncommon
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Zeolite; framework silicate (tectosilicate), Strunz classification 9.GE
Buy Harmotome specimens
View all 10Where Harmotome is found
Top localities
- St Andreasberg Mining District3 specimens
- Strontian3 specimens
- St Andreasberg2 specimens
- Haskovo Province1 specimen
- Samson Mine1 specimen
- Loanhead Quarry1 specimen
About Harmotome
Notable specimens have been found in several classic European and North American localities, with Germany, the United Kingdom, and the Czech Republic featuring among historically important occurrences, and the United States and Bulgaria contributing notable pockets of material. Harmotome typically forms in low-temperature hydrothermal environments and as a weathering product of borosilicate-rich rocks, often associated with other framework silicates and zeolite-group minerals. Collectors prize its gentle luster, crystal forms, and the way fresh surfaces reveal subtle color and clarity. Its relative rarity enhances its desirability among mineral enthusiasts who appreciate the balance between aesthetic crystals and the mineral’s informative geological context.
