Where is Dendritic Opal found?

Dendritic Opal 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 Dendritic Opal

Collecting tips

1. Look for Silica-Rich Environments. Search in areas with past or present volcanic activity, hot springs, or sedimentary beds where silica-rich fluids have circulated. Look for geodes, nodules, or vein fillings.
2. Examine Common Opal. Dendritic opal is a variety of common opal. Collect and inspect common opal specimens for internal patterns. The dendrites are often visible through the translucent to opaque opal matrix.
3. Check for Manganese Staining. The presence of black or dark brown manganese staining or coatings on surrounding rocks can indicate a favorable environment for manganese oxide formation, which are the dendrites.
4. Use a Loupe or Magnifier. The dendritic patterns can be intricate and fine, requiring magnification for clear observation and appreciation.

Quick Check

Color:

White, gray, cream, or light brown matrix with black or dark brown fern-like patterns.

Luster:

Vitreous to waxy.

Streak:

White (for the opal matrix); the manganese dendrites are internal and do not produce a streak on the opal surface.

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