Lansfordite
A variety of Minerals
What is Lansfordite?
Lansfordite is a hydrated magnesium carbonate mineral with composition: MgCO3·5H2O. Landsfordite was discovered in 1888 in a coal mine in Lansford, Pennsylvania. It crystallizes in the monoclinic system (space group P21/c) and typically occurs as colorless to white prismatic crystals and stalactitic masses. It is a soft mineral, Mohs hardness of 2.5, with a low specific gravity of 1.7. It is transparent to translucent with refractive indices of 1.46 to 1.51. The mineral will effloresce at room temperature, producing nesquehonite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Lansfordite 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.
Lansfordite Localities Map
See where Lansfordite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless (fresh), white (exposed); colourless in transmitted light.
- Hardness (Mohs)
- 2.5
- Density
- 1.7 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- MgCO3 · 5H2O
- Elements
- C, H, Mg, O
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Lansfordite FAQs
How do I identify Lansfordite?
Lansfordite can be identified by its hardness of 2.5 on the Mohs scale, Colourless (fresh) color. Look for these key characteristics when examining specimens.
What color is Lansfordite?
Lansfordite typically appears in Colourless (fresh), white (exposed); colourless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Lansfordite?
Lansfordite 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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