Ankerite
A variety of Dolomite Group
What is Ankerite?
Ankerite is a relatively common mineral usually occurring in translucent shades of browns, greys, yellows, and greens. This mineral is very similar to dolomite but has iron (III) and manganese instead of magnesium. Because of this, it is usually found in iron-containing rocks as well as carbonate-rich alkaline rocks.
Uses & Applications
Ankerite is used as a source of iron in some areas, though this use is limited due to its rarity. Iron has a very wide range of uses including buildings, surgical instruments, pipes, bridges, and tools.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Ankerite 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.
Ankerite Localities Map
See where Ankerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Brown, white to grey, yellowish-brown, tan, fawn, greenish
- Hardness (Mohs)
- 3.5 - 4
- Density
- 3.11 g/cm³
- Streak
- White
- Luster
- Pearly
- Crystal System
- Trigonal
Chemical Properties
- Chemical Formula
- Ca(Fe2+,Mg)(CO3)2
- Elements
- C, Ca, Fe, Mg, O
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Ankerite FAQs
How do I identify Ankerite?
Ankerite can be identified by its hardness of 3.5 - 4 on the Mohs scale, Brown color, Pearly luster, Trigonal crystal system. Look for these key characteristics when examining specimens.
What color is Ankerite?
Ankerite typically appears in Brown, white to grey, yellowish-brown, tan, fawn, greenish. Color can vary depending on impurities and formation conditions.
How hard is Ankerite?
Ankerite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.
