Yttrialite-(y)
Yttrialite-(Y)
A variety of Minerals
What is Yttrialite-(y)?
Yttrialite or Yttrialite-(Y) is a rare yttrium thorium sorosilicate mineral with formula: (Y,Th)2Si2O7. It forms green to orange yellow masses with conchoidal fracture. It crystallizes in the monoclinic-prismatic crystal system. It has a Mohs hardness of 5 to 5.5 and a specific gravity of 4.58. It is highly radioactive due to the thorium content. It is found associated with gadolinite. It was first described in 1889 for an occurrence in the Rode Ranch pegmatite on Baringer Hill, Llano County, Texas. It has also been reported from the Suishouyama pegmatite on Honshū, Japan, and from occurrences in Norway and Sweden.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Yttrialite-(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.
Yttrialite-(y) Localities Map
See where Yttrialite-(y) is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Olive-green, brown to black; often with an orange-yellow crust
- Hardness (Mohs)
- 5 - 5.5
- Density
- 4 g/cm³
Chemical Properties
- Chemical Formula
- (Y,Th)2Si2O7
- Elements
- O, Si, Th, Y
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Yttrialite-(y) FAQs
How do I identify Yttrialite-(y)?
Yttrialite-(y) can be identified by its hardness of 5 - 5.5 on the Mohs scale, Olive-green color. Look for these key characteristics when examining specimens.
What color is Yttrialite-(y)?
Yttrialite-(y) typically appears in Olive-green, brown to black; often with an orange-yellow crust. Color can vary depending on impurities and formation conditions.
How hard is Yttrialite-(y)?
Yttrialite-(y) has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.
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