Kidwellite

A variety of Minerals

What is Kidwellite?

Market Value Factors

Pricing varies for every rock and mineral, so use these universal factors to gauge Kidwellite 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.

Applies to all rocks & minerals.

Quick Facts

Physical Properties

Color: Greenish yellow, Greenish white, Yellow, Light green
Hardness (Mohs): 3
Rock tumbling: Not recommended
Density: 3.34 g/cm³
Streak: yellow

Chemical Properties

Chemical Formula: NaFe³⁺9+x(PO₄)₆(OH)₁₁ · 3H₂O, x = 0.33 Formula is slightly simplified; for details see Kolitsch (2004).
Elements: Fe, H, Na, O, P

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Kidwellite FAQs

How do I identify Kidwellite?

Kidwellite can be identified by its hardness of 3 on the Mohs scale, Greenish yellow color. Look for these key characteristics when examining specimens.

What color is Kidwellite?

Kidwellite typically appears in Greenish yellow, Greenish white, Yellow, Light green. Color can vary depending on impurities and formation conditions.

How hard is Kidwellite?

Kidwellite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.