Properties
⚖ Density4.371 g/cm³
Heavy
🔷 Monoclinic✏️ streak white
| Chemical formula | PbCa₂(ZnSiO₄)₃ |
|---|---|
| Elements | Pb, Ca, Zn, Si, O |
| Crystal system | Monoclinic |
| Mohs hardness | — |
| Density | 4.371 g/cm³ |
| Streak | white |
| Color | — |
| IMA symbol | Epr |
| Nickel–Strunz class | 9.AB.15 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
✺ Glows under UV
| Shortwave UV (~254 nm) | Brilliant lemon-yellow |
|---|---|
| Phosphorescence (afterglow) | Weak phosphorescence |
A Franklin, NJ specialty, plain white in daylight and dazzling under shortwave UV.
Reactions vary by locality and specimen; many specimens of a fluorescent species do not glow. Shortwave UV can burn skin and damage eyes. Wear UV-blocking glasses, and never look into any UV lamp. Sources: Franklin Mineral Museum fluorescent mineral checklist · Wikipedia: Esperite. More UV-reactive stones →
🌍 Where it's found
Type locality (where it was first described): Parker shaft, United States
Learn more
- Esperite on Mindat.org
- Wikipedia article
- Wikidata item Q1815768 (source of this page's data – you can correct it there)
IMA mineral species
Monoclinic
White & Clear
ShortwavePhosphorescentUV reactive