Zircon
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ZrSiO4
Zircon is the oldest mineral found on Earth, with some crystals dating back 4.4 billion years. It is an important accessory mineral in igneous rocks and a key mineral for geochronology (U-Pb dating). The gem variety comes in many colors.
| Crystal System | Tetragonal |
| Mineral Class | 09 Silicates |
| Mohs Hardness | 6.5-7.5 |
| Specific Gravity | 3.93-4.73 |
| Color | Colorless, yellow, brown, red, green, blue |
| Luster | Adamantine |
| Streak | Colorless |
| Cleavage | Poor {110}, {111} |
| Fracture | Conchoidal |
| Transparency | Transparent |
| Crystal Habit | Prismatic with pyramidal terminations |
Mohs Hardness
Mohs Hardness: 6.5 – 7.5
1 Soft10 Hard
| Mohs Hardness | Reference Mineral |
|---|---|
| 1 | Talc |
| 2 | Gypsum |
| 3 | Calcite |
| 4 | Fluorite |
| 5 | Apatite |
| 6 | Orthoclase |
| 7 | Quartz |
| 8 | Topaz |
| 9 | Corundum |
| 10 | Diamond |
Crystal System
Tetragonal
| Property | Value |
|---|---|
| Crystal System | Tetragonal |
| Axial Relationships | a = b ≠ c, α = β = γ = 90° |
Explore on Science FYI
Frequently Asked Questions
What is the hardness of Zircon?
Zircon has a Mohs hardness of 6.5-7.5.
What crystal system does Zircon belong to?
Zircon crystallizes in the Tetragonal crystal system.
What color is Zircon?
Zircon is typically Colorless, yellow, brown, red, green, blue.
What type of luster does Zircon have?
Zircon exhibits a Adamantine luster.
What is the chemical formula of Zircon?
The chemical formula of Zircon is ZrSiO4.