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LLANITE SPHERES 4″

$80.00

LLANITE SPHERE 4″ DIA  1 3/4 LBS

SKU: LL104S Category: Tags: ,

Description

Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.

Llanite comes from a hypabyssal porphyritic rhyolite dike that intrudes Precambrian metamorphics in the Llano Uplift of central Texas. Published radiometric dating on this llanite indicates that it’s 1.106 billion years old (late Mesoproterozoic).

Additional information

Shipping Points200 units

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