a. A hexagonal mineral, Fe2 Ti3 O9 ; in irregular
metallic steel-gray masses in pegmatite veins near Hackberry, AZ. Formerly
b. A mixture of hematite, rutile, ilmenite, and anatase. AGI
c. An ore of micaceous iron, silver iodide, gold, iron sulfides, and
antimony in a vein in Yavapai County, AZ. AGI
d. A hypabyssal rock with 80% quartz, 18% alkali feldspar, and accessory
mica and apatite in Arizona (not a rock name in the IUGS classification).
Dictionary of Mining, Mineral, and Related Terms