Seamanite
A variety of Minerals
What is Seamanite?
Seamanite is a transparent, yellow to pink mineral that occurs as needle-shaped crystals. Seamanite is a brittle mineral with a mohs hardness of 4. It is found in the crevices of fractured siliceous rock. The type occurrence was found in association with small crystals of calcite, thin coatings of manganese oxide, and fibrous sussexite. Seamanite has also been found with shigaite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Seamanite 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.
Seamanite Localities Map
See where Seamanite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Yellow, pink, yellow-brown; colourless in transmitted light
- Hardness (Mohs)
- 4
- Density
- 3.13 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Mn2+3B(OH)4(OH)2
- Elements
- B, H, Mn, O, P
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Seamanite FAQs
How do I identify Seamanite?
Seamanite can be identified by its hardness of 4 on the Mohs scale, Yellow color. Look for these key characteristics when examining specimens.
What color is Seamanite?
Seamanite typically appears in Yellow, pink, yellow-brown; colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Seamanite?
Seamanite has a hardness of 4 on the Mohs scale. This gives it moderate hardness.
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