Post by 1dave on Nov 20, 2020 8:35:21 GMT -7
Has anyone tried cabbing sanidine crystals?
Sanidine is the high temperature form of potassium feldspar. It often has a blue flash.
In the U.S., Sanidine is found in many places including the Ragged Mountain, Gunnison Co., Colorado; the Black Range, Grant Co., New Mexico; the Sandia Mts., Bernalillo Co., New Mexico, Bisbee, Cochise Co., Arizona; and the Thomas Range, Juab Co., Utah.
Local geologists testify the best is found in the Ox valley Tuff south and west of Enterprise Utah clear into Nevada.
West of Cedar City Utah it can be found around Modina just east of the Nevada border.
Sanidine is the high temperature form of potassium feldspar. It often has a blue flash.
In the U.S., Sanidine is found in many places including the Ragged Mountain, Gunnison Co., Colorado; the Black Range, Grant Co., New Mexico; the Sandia Mts., Bernalillo Co., New Mexico, Bisbee, Cochise Co., Arizona; and the Thomas Range, Juab Co., Utah.
Local geologists testify the best is found in the Ox valley Tuff south and west of Enterprise Utah clear into Nevada.
ngmdb.usgs.gov/Geolex/UnitRefs/OxValleyRefs_9725.html
Summary:
K-Ar age of 12.3 Ma reported on whole rock from a basalt that directly underlies Ox Valley Tuff north-northwest of Veyo, Washington Co., UT, Great Basin province. A K-Ar age of 11.4 Ma reported on biotite from a rhyolite flow that overlies Ox Valley Tuff near Enterprise Reservoir in Washington Co., UT. These determinations bracket the Ox Valley as Miocene age.
Summary:
K-Ar age of 12.3 Ma reported on whole rock from a basalt that directly underlies Ox Valley Tuff north-northwest of Veyo, Washington Co., UT, Great Basin province. A K-Ar age of 11.4 Ma reported on biotite from a rhyolite flow that overlies Ox Valley Tuff near Enterprise Reservoir in Washington Co., UT. These determinations bracket the Ox Valley as Miocene age.
West of Cedar City Utah it can be found around Modina just east of the Nevada border.
Here are a couple of pieces I picked up by a fluorite mine 20-30 miles north of Modina about 10 years ago.
The blue flash is illusive but present in them.
The blue flash is illusive but present in them.