mineral
Polished dendritic agate pendant
Microcrystalline quartz (SiO₂), with dark manganese- or iron-oxide dendrites
AI-generated identification · may be incorrectMohs hardness 6.5–7; gray, cream, and black patterns; waxy to vitreous polish; cryptocrystalline quartz with no visible cleavage. The metal-colored bail is jewelry hardware, not part of the specimen.
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Physical properties
Mohs hardness 6.5–7; gray, cream, and black patterns; waxy to vitreous polish; cryptocrystalline quartz with no visible cleavage. The metal-colored bail is jewelry hardware, not part of the specimen.
Formation & geological history
Silica-rich groundwater filled cavities or fractures and deposited chalcedony; later mineral oxides formed branching dendrites. Agate deposits occur in rocks of many ages, so this specimen’s age and source cannot be determined from the image.
Uses & applications
Used in pendants, beads, and decorative objects; agate is also used for ornaments and small precision parts.
Geological facts
Dendrites are mineral-oxide patterns that resemble branches or ferns, not fossils or plant remains.
Field identification & locations
Look for translucent chalcedony, curved or irregular banding, and fernlike dark inclusions; common sources include Brazil, Uruguay, India, and the United States. The image does not establish a precise locality.
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