Decrespignyite-(y)
Decrespignyite-(Y)
A variety of Minerals
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What is Decrespignyite-(y)?
Decrespignyite-(Y) is a copper yttrium rare earth carbonate chloride hydrate; With a simple formula of; Cu(Y, REE)4(CO3)4(OH)5Cl · 2H2O Usually found as single pseudohexagonal platelets, often curved, and regularly measuring 10-50μm in size. It appears as royal blue to turquoise blue in colour, with a pale blue streak, and a pearly to vitreous lustre. Regarded as a supergene mineral which is believed to be formed through by mildly carbonated ground waters precipitating through the ore body. It is often associated with malachite, kamphaugite-(Y), donnayite-(Y) and caysichite-(Y)
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Decrespignyite-(y) 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.
Quick Facts
Physical Properties
- Color
- Bright royal blue to pale blue
- Hardness (Mohs)
- 4
- Rock tumbling
- Not recommended
- Density
- 3.645 g/cm³
- Streak
- pale blue
Chemical Properties
- Chemical Formula
- Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O
- Elements
- C, Cl, Cu, H, O, Y
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Decrespignyite-(y) FAQs
How do I identify Decrespignyite-(y)?
Decrespignyite-(y) can be identified by its hardness of 4 on the Mohs scale, Bright royal blue to pale blue color. Look for these key characteristics when examining specimens.
What color is Decrespignyite-(y)?
Decrespignyite-(y) typically appears in Bright royal blue to pale blue. Color can vary depending on impurities and formation conditions.
How hard is Decrespignyite-(y)?
Decrespignyite-(y) has a hardness of 4 on the Mohs scale. This gives it moderate hardness.
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