Esperite

Add one script tag to your page:

<div data-gemfyi="entity" data-slug="esperite"></div>
<script src="https://cdn.jsdelivr.net/npm/gemfyi-embed@1/dist/embed.min.js" defer></script>

Embed as an iframe:

<iframe src="https://gemfyi.com/iframe/entity/esperite/?style=modern&theme=light" width="420" height="400" frameborder="0" loading="lazy" style="border:0;border-radius:10px;max-width:100%"></iframe>

Paste the URL in WordPress, Medium, or Ghost:

https://gemfyi.com/ar/gems/esperite/

Shields.io-compatible SVG badge:

Esperite badge ![Esperite](https://gemfyi.com/badge/entity/esperite.svg)

Web Component:

<gemfyi-entity slug="esperite"></gemfyi-entity>
<script src="https://cdn.jsdelivr.net/npm/gemfyi-embed@1/dist/embed.min.js" defer></script>

Physical & Optical Properties

Mohs Hardness 5,0 – 5,5
Specific Gravity 4,28 – 4,42
Refractive Index 1,76 – 1,774
Crystal System Monoclinic
Luster Greasy,Dull (Earthy)
Cleavage Distinct,Poor
Fracture Conchoidal
Color various

Mohs Hardness

Mohs Hardness: 5,0 – 5,5
1 Soft10 Hard

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Esperite

Esperite is a very rare calcium zinc silicate mineral found almost exclusively in the zinc mining district of Franklin, New Jersey, USA, one of the world's most remarkable localities for fluorescent minerals. It typically appears colorless to white under normal light but fluoresces a vivid yellow under UV illumination, making it a prized component of fluorescent mineral collections. Faceted esperite is an extreme rarity known only to advanced collectors.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Esperite?
Esperite is a very rare calcium zinc silicate mineral found almost exclusively in the zinc mining district of Franklin, New Jersey, USA, one of the world's most remarkable localities for fluorescent minerals. It typically appears colorless to white under normal light but fluoresces a vivid yellow un
What is the hardness of Esperite?
Esperite has a Mohs hardness of 5.0 to 5.5, making it moderate for use in jewelry.
What color is Esperite?
Esperite is primarily Various.
How much does Esperite cost?
Esperite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Esperite?
Esperite belongs to the Monoclinic crystal system.

More Semi-Precious Gems Gems