Kroupaite

kroupaite

fourmarierite

metaschoepite

liebigite

Images

Formula: KPb_0.5[(UO₂)₈O₄(OH)₁₀].10H₂O
or
KPb_0.5[(U⁶⁺O₂)₈O₄(OH)₁₀].10H₂O

Hydroxide, uranyl mineral
Crystal System: Orthorhombic
Specific gravity: 5.058 calculated for the empirical formula
Hardness: 2
Streak: Light yellow
Colour: Orange-yellow
Luminescence: Not fluorescent under UV
Solubility: Soluble in dilute hydrochloric acid, with no effervescence
Environments

Hydrothermal environments

Kroupaite is a relatively new mineral, approved in 2017

Localities

At the type locality, the Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, kroupaite is of supergene origin formed by oxidation-hydration alteration of uraninite. Associated minerals include fourmarierite, sodium-rich metaschoepite, uranopilite, liebigite, ewingite and gypsum (HOM)

Kroupaite from the Svornost mine - Image

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