On Sat, Oct 29th, we will visit the famous Pleistocene Lake Tecopa Beds in search of the nodules containing precious opal. Some of the opals resemble white porcelain, frequently with pale signs of colorful fire.

At Lake Tecopa, in California, white play-of-color opals are found in vesicles of a volcanic ash layer from the Huckleberry Ridge Tuff super-eruption (2.1 Ma). They show characteristic traits of...

2021年11月13日 · Fieldtrips are for MSSC members only. Guests are welcome to join the society at the next fieldtrip or by applying here.

2018年5月1日 · At Lake Tecopa, in California, white play-of-color opals are found in vesicles of a volcanic ash layer from the Huckleberry Ridge Tuff super-eruption (2.1 Ma). They show characteristic traits of opal-AG by X-ray diffraction and scanning electron microscopy (silica spheres of ∼330 nm).

34 documented in opal and require more systematic work, but this study reveals that, in Tecopa 35 opals, molecular water (H 2 O m ) is isotopically heavier than structural water (OH), (a 36 phenomena already well-known in amorphous volcanic glass).

Click here to view Opal data: Locality Data: Click here to view Ash Meadows Zeolite deposit, Shoshone, Dublin Hills, Inyo County, California, USA: Data Identifiers: Mindat Occurrence Record ID: 326651: Long-form Identifier: 1:3:326651:9: GUID : 685136e4-6923-40e5-9101-a990f6e477fa: Nearest other occurrences of Opal

At Lake Tecopa, in California, white play-of-color opals are found in vesicles of a volcanic ash layer from the Huckleberry Ridge Tuff super-eruption (2.1 Ma). They show characteristic traits of opal-AG by X-ray diffraction and scanning electron microscopy (silica spheres of ~330 nm).

2018年4月30日 · Abstract At Lake Tecopa, in California, white play-of-color opals are found in vesicles of a volcanic ash layer from the Huckleberry Ridge Tuff super-eruption (2.1 Ma). They show characteristic traits of opal-AG by X-ray diffraction and scanning electron microscopy (silica spheres of ~330 nm).

Lake Tecopa Basin ⓘ Lake Tecopa Zeolite deposit (2005) Mineral Resources Data System (MRDS), US Geological Survey. Lookout Mountain ⓘ Pickup Mine (Chipmunk Mine) [Opal-A var. Opal-AN] Former Howard Merk collection Former Howard Merk collection: Saline Valley; Badwater Springs ⓘ Unnamed Diatomite occurrence [1]

Click here to view Opal data: Locality Data: Click here to view Lake Tecopa Zeolite deposit, Lake Tecopa Basin, Inyo Co., California, USA: Data Identifiers: Mindat Occurrence Record ID: 886588: Long-form Identifier: 1:3:886588:5: GUID : 45d975ee-3a1c-4cc7-83ab-85e740d01de5: Nearest other occurrences of Opal