Tobermorite
A variety of Minerals
What is Tobermorite?
Tobermorite is a calcium silicate hydrate mineral with chemical formula: Ca5Si6O16(OH)2·4H2O or Ca5Si6(O,OH)18·5H2O. Two structural varieties are distinguished: tobermorite-11 Å and tobermorite-14 Å. Tobermorite occurs in hydrated cement paste and can be found in nature as alteration mineral in metamorphosed limestone and in skarn. It has been reported from the Maqarin Area of north Jordan and in the Crestmore Quarry near Crestmore Heights, Riverside County, California. Tobermorite was first described in 1880 for an occurrence in Scotland, on the Isle of Mull, around the locality of Tobermory.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tobermorite 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.
Tobermorite Localities Map
See where Tobermorite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White, light pink
- Hardness (Mohs)
- 2.5
Chemical Properties
- Chemical Formula
- [Ca4Si6O17 · 2H2O]·(Ca·3H2O)
- Elements
- Ca, H, O, Si
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Tobermorite FAQs
How do I identify Tobermorite?
Tobermorite can be identified by its hardness of 2.5 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Tobermorite?
Tobermorite typically appears in White, light pink. Color can vary depending on impurities and formation conditions.
How hard is Tobermorite?
Tobermorite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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