Tusionite
A variety of Minerals
What is Tusionite?
Tusionite is a rare colorless to transparent to translucent yellow brown trigonal borate mineral with chemical formula: MnSn(BO3)2. The mineral is composed of 18.86% manganese, 40.76% tin, 7.42% boron, and 32.96% oxygen. It is a late stage hydrothermal mineral and occurs rarely in granite pegmatites in miarolitic cavities. Tusionite was named for the location where the mineral was first discovered and described in 1983 in the Tusion River Valley in the Pamir Mountains of Tajikistan. Tusionite has also been reported from Recice in the Czech Republic and in pegmatites at Thomas Mountain, Riverside County, California.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tusionite 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.
Tusionite Localities Map
See where Tusionite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, Yellow-brown, honey yellow
- Hardness (Mohs)
- 5 - 6
- Density
- 4.85 g/cm³
Chemical Properties
- Chemical Formula
- Mn2+Sn4+[BO3]2
- Elements
- B, Mn, O, Sn
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Tusionite FAQs
How do I identify Tusionite?
Tusionite can be identified by its hardness of 5 - 6 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Tusionite?
Tusionite typically appears in Colourless, Yellow-brown, honey yellow. Color can vary depending on impurities and formation conditions.
How hard is Tusionite?
Tusionite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
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