Minerals identify

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Spessartite

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Lamprophyres (Greek λαμπρός (lamprós) = "bright" and φύρω (phýro) = to mix) are uncommon, small volume ultrapotassic igneous rocks, lopoliths and small intrusions silica or ultramafic oxide, >3% potassium and chromium.

Lamprophyres occur throughout all geologic eras examples are commonly associated with lode gold deposits. Cenozoic and South America , and young ultramafic lamprophyres from Gympie with 18.5% MgO at ~250 Ma.

Identification