In addition, due to their lower calcination temperatures, the formation of pseudobrookite
at the interfaces between Ti and Fe containing layers is prevented.
In addition to topaz, the most common vapor phase minerals include quartz, garnet, hematite, pseudobrookite
, bixbyite, red beryl, and fluorite; many of which are uncommon in silicic volcanic rocks.
Holfert has also found crystals at the end of that canyon, at the Maynard Topaz mine (on the western slope of Topaz Valley at the southern end of Topaz Mountain), and at the pseudobrookite location 1 mile south of Pismir Wash (western part of the Thomas Range).
Also common are columnar crystals of pseudobrookite, niobian rutile, cristobalite, magnetite and cryptocrystalline cassiterite.
He has collected brookite at Magnet Cove, Arkansas; wavellite at Mauldin Mountain; quartz at Coleman's mine in Jesseville, Arkansas; blue barite at Stoneham, Colorado; pyrite at the Dallas-Fort Worth Airport; clear barite at Grand Junction; quartz at Herkimer, New York; red beryl at the Wah Wah Mountains in Utah; topaz and pseudobrookite
at Topaz Mountain; and tourmaline at the Himalaya mine in California.
52 (1988), 133 Plumbotellurite Pending Pseudobrookite
contains significant quantities of manganese (6.