Lithic Materials – MDEQ
Quartz - Varieties and Types of Quartz (Photos) - Geology In
Pineapple Quartz - Geology In
Full article: Connoisseur's Choice: Ferruginous Quartz, Tinejdad, Errachidia Province, Drâa-Tafilalet Region, Morocco
Ferruginous Quartz from Crystal Mountain, Liberty, Swauk Mining District, Kittitas County, Washington, USA
Minerals - Types, Properties, and Examples (With Images) - Geology In
5.7 Plate Of Hematoid (Ferruginous) Quartz - Morocco (#39166) For Sale
Sandstone - Formation, Classification, and Types - Geology In
Intriguing minerals: quartz and its polymorphic modifications
Amazing Geologist
Open File Report 5602 - Geology Ontario
Quartz Properties, Varieties, Occurrence and Uses