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22.0 Quartz latite. Locality unknown. Weathered, red-brown biotite phenocrysts and a few clear to white sanidine (alkali feldspar) phenocrysts are surrounded by a pinkish-purple, aphanitic, crystalline groundmass. [Scale shows cm divisions.]
Image 51 of 156
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![22.0 Quartz latite. Locality unknown. Weathered, red-brown biotite phenocrysts and a few clear to white sanidine (alkali feldspar) phenocrysts are surrounded by a pinkish-purple, aphanitic, crystalline groundmass. [Scale shows cm divisions.]](../22.0.JPG)