Carletonite

Q: What is Carletonite?

Carletonite is a very rare blue to colorless potassium sodium calcium silicate carbonate mineral known from only one significant locality: Mont Saint-Hilaire, Quebec, Canada, where it occurs in a nepheline syenite intrusion. It was named after Carleton University in Ottawa, and its vivid sky-blue tr

Q: What is the hardness of Carletonite?

Carletonite has a Mohs hardness of 4.0 to 4.5, making it relatively soft for use in jewelry.

Q: What color is Carletonite?

Carletonite is primarily Various.

Q: How much does Carletonite cost?

Carletonite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.

Q: What is the crystal system of Carletonite?

Carletonite belongs to the Tetragonal crystal system.

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 4,0 – 4,5

Specific Gravity 2,45

Refractive Index 1,517 – 1,521

Crystal System Tetragonal

Luster Vitreous

Cleavage Perfect

Color various

Birefringence 0,004

Pleochroism Some of the blue specimens may show blue to pinkish brown pleochroism

Mohs Hardness

Mohs Hardness: 4,0 – 4,5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Carletonite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

About Carletonite

Carletonite is a very rare blue to colorless potassium sodium calcium silicate carbonate mineral known from only one significant locality: Mont Saint-Hilaire, Quebec, Canada, where it occurs in a nepheline syenite intrusion. It was named after Carleton University in Ottawa, and its vivid sky-blue transparent crystals are among the most sought-after rarities from the Mont Saint-Hilaire locality. Faceted carletonite is an extreme rarity in specialist collections.