sedimentary
Brown Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Variegated shades of brown, tan, and cream; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None, conchoidal fracture; Specific gravity: 2.58-2.64
- Hardness
- 6
- Color
- Variegated shades of brown, tan, and cream
- Luster
- Vitreous to waxy
Identified More sedimentary →
Explore Brown Agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Variegated shades of brown, tan, and cream; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None, conchoidal fracture; Specific gravity: 2.58-2.64
Formation & geological history
Formed in voids of volcanic rocks or ancient sedimentary formations through the slow deposition of silica from groundwater. This specimen appears water-worn or tumbled, likely from an alluvial deposit.
Uses & applications
Commonly used for lapidary work, jewelry (beads and cabochons), home decor, and spiritual/metaphysical collecting.
Geological facts
Agate is a variety of chalcedony that is defined by its banding or variegated patterns. Humans have used agate since the Neolithic era for ornaments and amulets.
Field identification & locations
Identify in the field by its translucency (when held to light), waxy feel, and lack of visible grains. Common in riverbeds and coastal areas globally.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary