Mineral variety ✺ Glows under UV

Wernerite

Scapolite variety.

Properties

Chemical formula—
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Mohs hardness—
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Streak—
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“—” means no reliable value in Wikidata yet. Check Mindat for full data.

✺ Glows under UV

Longwave UV (~365 nm)Brilliant yellow, one of the brightest longwave minerals (Grenville, Quebec)
Shortwave UV (~254 nm)Weak yellowish

Wernerite is an old name for intermediate scapolite. Specimens from the Grenville region of Quebec and Ontario are famous for their glow.

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: Fluorescent Mineral Society FMDB (Grenville wernerite) · fluomin.org: Wernerite. More UV-reactive stones →