Quartz (milky vein quartz) with iron-oxide staining — mineral Identification & Properties | Geo-Gem
Quartz (milky vein quartz) with iron-oxide staining is a mineral. 1) Scratch test: Try to scratch the specimen with a steel knife and then try scratching window glass with the specimen. Quartz will not be scratched by the knife and will scratch glass. 2) Streak: On unglazed porcelain, quartz leaves a whi…