
Polished brecciated jasper (likely septarian or iron-rich jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7 for the jasper matrix; opaque, dark brown to black with rusty yellow-brown patches and a glassy-to-waxy polish. Massive cryptocrystalline quartz lacks visible cleavage; specific gravity is about 2.5–2.7.
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