gemstone
Batu Akik (Chalcedony / Agate rings)
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness 6.5–7, vitreous to waxy luster, trigonal cryptocrystalline system, showing translucent red, amber, banded, and picture patterns.
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Physical properties
Mohs hardness 6.5–7, vitreous to waxy luster, trigonal cryptocrystalline system, showing translucent red, amber, banded, and picture patterns.
Formation & geological history
Formed via low-temperature hydrothermal silica deposition within cavities of volcanic or sedimentary rocks across Indonesia.
Uses & applications
Popularly cut into cabochons for traditional rings ('cincin akik'), amulets, and ornamental jewelry.
Geological facts
Highly treasured in Indonesian culture (Batu Akik craze), where natural inclusions or motifs ('batu gambar') are believed to hold mystical or symbolic significance.
Field identification & locations
Identified by hardness, lack of cleavage, cool touch, and distinct natural inclusion patterns under backlighting.
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