mineral
Red Agate / Carnelian
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5–7 (Mohs scale), Color: Deep translucent red to reddish-orange, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None/Conchoidal fracture
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Deep translucent red to reddish-orange, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None/Conchoidal fracture
Formation & geological history
Formed through volcanic activity and silica-rich groundwater filling cavities in igneous rocks. The location 8.4°S (East Java, Indonesia) is a region rich in volcanic chalcedony and decorative stones.
Uses & applications
Commonly used in traditional jewelry like this ring, beads, and carvings. Known as 'Akik Merah' locally in Indonesia.
Geological facts
Red stones like this are historically popular in Indonesian culture (Batu Akik), believed by some to provide protection and courage. The specific red color is caused by impurities of iron oxide (hematite).
Field identification & locations
Identify by its hardness (will not scratch with a copper penny) and its translucent depth. Found commonly in riverbeds and volcanic deposits in Java.
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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