mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, waxy to vitreous luster, translucent to semi-opaque, microcrystalline trigonal structure, greyish-blue and brownish-orange colour banding, no cleavage, specific gravity ~2.6.
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Physical properties
Hardness 6.5-7 on Mohs scale, waxy to vitreous luster, translucent to semi-opaque, microcrystalline trigonal structure, greyish-blue and brownish-orange colour banding, no cleavage, specific gravity ~2.6.
Formation & geological history
Forms from low-temperature silica-rich fluids filling cavities inside volcanic rocks (such as basalt or rhyolite) or sedimentary formations. Common in the ancient volcanic regions of eastern Australia (including New South Wales and Queensland).
Uses & applications
Polished and shaped as a pendant gemstone for jewelry and ornamental lapidary collections.
Geological facts
Agates are famous for their microcrystalline silica bands, which form in concentric or subtle layered patterns as mineral-rich water precipitates layer after layer inside rock pockets.
Field identification & locations
Identified by its waxy luster, smooth polished surface, high hardness (scratches glass), and translucent color gradations. Commonly collected along riverbeds, coastal regions, and volcanic terrains in Australia.
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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