Quartz with Biotite | Rectangle Cabochon | Brazil | 27x13x6 | 19.5 carats | QU541
Quartz with Biotite | Rectangle Cabochon | Brazil | 27x13x6 | 19.5 carats | QU541
Quartz with Biotite is a natural mineral inclusion specimen, formed when black biotite mica crystals become encapsulated within a host quartz crystal during the growth process deep within the Earth. Brazil is one of the world's premier sources for included quartz varieties, producing specimens of exceptional clarity and striking visual contrast between the transparent host and the dark, flaky biotite inclusions within. Each stone is entirely unique, as the arrangement, density, and orientation of the biotite crystals is never replicated from one specimen to the next. This particular stone was likely exposed to air and water during the formation, causing the biotite to rust and make the coloring brown or red.
The appeal of Quartz with Biotite lies in its organic, almost landscape-like interior — dark mica flakes suspended in clear to milky quartz create a naturalistic depth that is highly sought after by designers working in earthy, botanical, or statement styles. The cabochon cut maximizes the visual display of the inclusions while providing a smooth, gently domed surface ideal for bezel settings, wire wrapping, and freeform designs. This is a stone that brings genuine geological character to finished jewelry.
DETAILS
Origin: Brazil
Species: Quartz
Variety: Quartz with Biotite Inclusions
Cut: Rectangle Cabochon
Size: 27mm x 13mm x 6mm
Weight: 19.5 ct
Sold: Individually
Treatment: None
Hardness: 7 (Mohs)
Refractive Index: 1.544 – 1.553
Materials: Quartz, Biotite.
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