This fire opal specimen comes from the Carbonera Mine near La Trinidad in the municipality of Tequisquiapan, Querétaro, Mexico. Bright orange opal occurs within a pale volcanic matrix.
The fire opal forms a compact, irregularly bounded area within the rock. Its vivid orange color contrasts clearly with the whitish to cream-colored matrix. The surface shows a waxy to slightly vitreous luster. Measuring 3.2 × 2.2 × 2.2 cm, the piece belongs to the miniature specimen size category.
Fire Opal from the Carbonera Mine
The Carbonera Mine near La Trinidad is one of Mexico’s well-known localities for fire opal and precious opal. Opal in various colors and forms has been documented from this mine.
The opals of the region occur in volcanic rocks. Silica-bearing fluids entered cavities and fractures within the rhyolite. The deposition of hydrous silica produced opal areas in a variety of colors. An orange to reddish body color is characteristic of fire opal.
The vivid orange opal, pale rhyolite matrix, and precise locality information make this piece a characteristic specimen from the Carbonera Mine.
| Feature | Details |
|---|---|
| Mineral | Fire Opal |
| Chemical Composition | Hydrous silicon dioxide, SiO₂ · nH₂O |
| Locality | Carbonera Mine, La Trinidad, Tequisquiapan, Querétaro, Mexico |
| Dimensions | 3.2 × 2.2 × 2.2 cm |
| Weight | 18.9 g |
| Specimen Size | Miniature specimen |
| Color | Vivid orange |
| Luster | Waxy to slightly vitreous |
| Transparency | Translucent |
| Habit | Compact opal area within pale matrix |
| Host Rock | Rhyolite |
| Special Feature | Fire opal from a well-known Mexican opal locality |
| Mineral | Fire Opal |
|---|---|
| Color | Orange |
| Size | Miniature specimen (3-5 cm) |
| Continent | North America |
| Country | Mexico |
| Feature | Classic locality |
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