Yooperlite
Sodalite-syenite
A variety of Syenite
What is Yooperlite?
Yooperlite is a unique and visually stunning variety of sodalite-rich syenite rocks found primarily around the Great Lakes region, particularly in Michigan's Upper Peninsula, hence the name derived from "Yooper" which refers to residents of Michigan's Upper Peninsula. This rock gained popularity and intrigue due to its ability to fluoresce under ultraviolet (UV) light.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Yooperlite 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.
Where to Find Yooperlite
RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find yooperlite in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find yooperliteAlways check the local rules and get the landowner's permission before you collect.
Key Characteristics
Composition of Yooperlite
Alkali Feldspar Group, Sodalite, Hornblende, Biotite
Quick Facts
Physical Properties
- Color
- Gray, orange, black, white, pink, blue-purple, etc.
- Hardness (Mohs)
- 5.5 - 6.5
- Rock tumbling
- With care
- Density
- 2.27 - 2.75 g/cm³
- Streak
- White
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Yooperlite FAQs
How do I identify Yooperlite?
Yooperlite can be identified by its hardness of 5.5 - 6.5 on the Mohs scale, Gray color. Look for these key characteristics when examining specimens.
What color is Yooperlite?
Yooperlite typically appears in Gray, orange, black, white, pink, blue-purple, etc.. Color can vary depending on impurities and formation conditions.
How hard is Yooperlite?
Yooperlite has a hardness of 5.5 - 6.5 on the Mohs scale. This gives it moderate hardness.
What is the composition of yooperlite of Yooperlite?
Alkali Feldspar Group, Sodalite, Hornblende, Biotite