mineral
Tumbled dendritic agate (likely)
Chalcedony, microcrystalline SiO₂, with dark manganese/iron-oxide inclusions
AI-generated identification · may be incorrectCreamy white to beige, polished, with dark branching or spot-like inclusions; Mohs hardness 6.5–7, waxy to vitreous luster, trigonal microcrystalline quartz. The photo alone cannot confirm the exact agate variety.
Identified More mineral →
Explore Tumbled dendritic agate (likely) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Creamy white to beige, polished, with dark branching or spot-like inclusions; Mohs hardness 6.5–7, waxy to vitreous luster, trigonal microcrystalline quartz. The photo alone cannot confirm the exact agate variety.
Formation & geological history
Silica-rich fluids deposited chalcedony in cavities or fractures, with oxides creating the dark markings; agates form in many ages and host rocks, commonly volcanic settings.
Uses & applications
Used for cabochons, beads, ornamental objects, and beginner mineral collections; this small tumbled piece is mainly decorative.
Geological facts
Agate is banded or patterned chalcedony; dendritic markings are mineral inclusions rather than plant fossils.
Field identification & locations
Look for hardness near 7, a smooth waxy polish, and inclusions within the stone rather than surface paint. Agates occur worldwide, including Brazil, Uruguay, India, and the western United States.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary