Vitrophyre

vit′rō-fīr, n. a porphyritic variety of volcanic gla .— adj. Vitrophyr′ic . [L. vitrum , gla , porphyrites , porphyry.] IMG:c394_ers_1908_Vitruvian_Scroll.png_utm_source_en.wiki source.org_utm_campaign_parser_utm_content_thumbnail:Chambers_1908_Vitruvian_Scroll.png-250px-Chambers_1908_Vitruvian_Scroll.png?utm_source=en.wiki source.org _campaign=parser _content=thumbnail