Quartz

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Physical & Optical Properties

Mohs Hardness 7.0
Specific Gravity 2.65
Refractive Index 1.544 – 1.553
Crystal System Trigonal
Luster Vitreous
Cleavage None
Fracture Conchoidal
Color various
Birefringence 0.009
Dispersion 0.013
Pleochroism Weakly dichroic

Mohs Hardness

Mohs Hardness: 7.0
1 Soft10 Hard

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Quartz

Quartz is the most abundant single mineral on Earth's continental crust, occurring in a vast array of colors and varieties including amethyst, citrine, rose quartz, smoky quartz, and rock crystal, all composed of silicon dioxide. Its hardness of 7, durability, and wide range of appearances have made it one of humanity's most utilized minerals for tools, jewelry, and technology since prehistoric times. Quartz crystals are also piezoelectric, enabling their use in watches, electronics, and precision instruments.

Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Quartz?
Quartz is the most abundant single mineral on Earth's continental crust, occurring in a vast array of colors and varieties including amethyst, citrine, rose quartz, smoky quartz, and rock crystal, all composed of silicon dioxide. Its hardness of 7, durability, and wide range of appearances have made
What is the hardness of Quartz?
Quartz has a Mohs hardness of 7.0, making it excellent for use in jewelry.
What color is Quartz?
Quartz is primarily Various.
How much does Quartz cost?
Quartz falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Quartz?
Quartz belongs to the Trigonal crystal system.

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