mineral
Chrysoprase-bearing quartz matrix (probable)
Nickeliferous chalcedony/quartz, SiO₂, with green nickel minerals such as garnierite or népouite
AI-generated identification · may be incorrectPale mint-green, white and gray material with brown iron-oxide staining; mostly dull to waxy luster and massive, microcrystalline texture. Quartz/chalcedony hardness is about 6.5–7 Mohs; the green phase is softer and its exact identity requires testing.
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Physical properties
Pale mint-green, white and gray material with brown iron-oxide staining; mostly dull to waxy luster and massive, microcrystalline texture. Quartz/chalcedony hardness is about 6.5–7 Mohs; the green phase is softer and its exact identity requires testing.
Formation & geological history
Likely formed when nickel-rich groundwater altered ultramafic rock, depositing silica and nickel-bearing minerals in fractures or cavities. Such deposits are commonly Cenozoic weathering products, though the specimen’s age cannot be determined visually.
Uses & applications
Used as a lapidary and ornamental material when the green color is attractive; otherwise mainly a mineral-collecting specimen. It is not suitable for structural construction.
Geological facts
The green color may resemble chrysoprase, but rough matrix specimens can also contain garnierite, népouite, serpentine, or copper minerals. Color alone cannot establish the species.
Field identification & locations
Look for waxy green chalcedony, white quartz, brown limonite, and association with altered ultramafic rock; a streak, hardness, specific-gravity, nickel, and laboratory analysis would improve identification. Common sources include Western Australia, Poland, Brazil, and New Caledonia.
