Where is Banded Onyx found?
Calcite (a variety of onyx marble)
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Open the appBanded Onyx occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Banded Onyx
Mexico
Particularly the states of Puebla and Oaxaca, known for high-quality, colorful onyx marble deposits.
Pakistan
Significant deposits, often exhibiting green and white banding.
Iran
Historical source of 'Oriental Alabaster', known for its translucent qualities.
Egypt
Ancient source of 'Egyptian Alabaster', used extensively in antiquity for vessels and sculptures.
Turkey
Various deposits, often with warm, earthy tones.
USA
Deposits found in Arizona, Utah, and California, often associated with hot springs.
Collecting tips
- Geological Context. Look for areas with limestone bedrock, active or ancient cave systems, or hot spring deposits. The presence of karstic topography is a strong indicator.
- Surface Indicators. Exposed outcrops may show banded patterns. Look for areas where water has flowed over limestone, depositing layers.
- Acid Test. A small drop of dilute hydrochloric acid (HCl) will cause calcite to effervesce (fizz) vigorously. This is a key diagnostic test to distinguish it from true onyx (quartz), which does not react.
- Hardness Test. Calcite has a Mohs hardness of 3, meaning it can be scratched by a copper coin (hardness ~3.5) or a steel knife (hardness ~5.5). True onyx (quartz) has a hardness of 7 and cannot be scratched by these items.
Quick Check
- Color:
- Banded, various colors (white, cream, yellow, green, pink, brown, red)
- Luster:
- Vitreous to waxy
- Streak:
- White
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