Hendricksite
A variety of Minerals
What is Hendricksite?
Hendricksite is a member of the trioctahedral micas group. The mineral was named by Clifford Frondel and Jun Ito in honor of Sterling Brown Hendricks, who studied micas. Zinc in the formula can be replaced with manganese(II) or magnesium. Currently, this is the only mica known for its zinc dominancy. It has a barely detectable radioactivity. It was approved in 1966 by the IMA.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hendricksite 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.
Hendricksite Localities Map
See where Hendricksite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Coppery brown, bronze-brown, dark reddish brown to reddish black
- Hardness (Mohs)
- 2.5 - 3
- Density
- 3.33 g/cm³
Chemical Properties
- Chemical Formula
- KZn3(Si3Al)O10(OH)2 Zn may be replaced by minor Mg and Mn(II).
- Elements
- Al, H, K, O, Si, Zn
Also Known As
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Hendricksite FAQs
How do I identify Hendricksite?
Hendricksite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Coppery brown color. Look for these key characteristics when examining specimens.
What color is Hendricksite?
Hendricksite typically appears in Coppery brown, bronze-brown, dark reddish brown to reddish black. Color can vary depending on impurities and formation conditions.
How hard is Hendricksite?
Hendricksite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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