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geologyin-blog · 2 days

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Extraordinary bi-color grape agate (Chalcedony) specimen from Indonesia

Photo: IndoMineral

#grape #grape agate #minerals #gems #crystals #gemstones #agate #chalcedony

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drafthearse · 3 months

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"Moss agate" is a rockhound term for finely-crystalline quartz (such as chalcedony) with greenish or brownish or blackish mineral inclusions. Locality: gravel bar along the Yellowstone River, Montana, USA

#moss agate #agate #chalcedony #quartz #mineral #transparent #png #finds

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artifacts-archive · 1 month

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Nile Catfish Pendant

Egyptian, ca. 1985-1773 BCE (Middle Kingdom, 12th dynasty)

This fish pendant represents a Synodontis Batensoda, more commonly known as the Nile catfish, a species of fish named for its black belly. Often worn at the end of a plait of hair, amulets like this one were used by children and young women to protect against drowning. This fine amulet is made of gold with stone inlays, including a red stone for the right eye and a green stone for the left. Amulets in the form of the Synodontis Batensoda were particularly popular during the Middle Kingdom, when the fish might have been identified with an astronomical constellation.

#artifact #Egypt #middle kingdom #pendant #gold #ceramic #chalcedony #turquoise #carnelian #lapis lazuli #black stone

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katharpy · 3 months

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last min portrait for todays oneshot

#dnd #d&d #chalcedony

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notwiselybuttoowell · 6 months

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Ellensburg Blue Agate - 3rd rarest gemstone in the world, being only found in Kittitas County in Washington State

#ellensburg #agates #chalcedony #geology #gemology

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allaboutrings · 2 months

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Victorian 14k Gold Chalcedony Intaglio Ring

#Rings #Jewelry #Chalcedony #Intaglio #Heart #Antique #Victorian #I love her #Size 5.5

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gemville · 6 months

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High Jewelry Ring by Dalben

15.24 Carat Namibian Chalcedony

0.10 CTW Diamonds

18k White and Rose Gold

Source: 1stdibs.com

#dalben #namibian #namibian chalcedony #chalcedony #diamonds #18k rose gold #18k white gold #chalcedony and diamond ring #chalcedony and diamond jewelry #high jewelry #luxury jewelry #fine jewelry #fine jewellery pieces #gemville

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thesilicontribesman · 2 months

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Ancient Amulets of Chalcedony, likely featuring Cupid, likely Cretian origin, Ashmolean Museum, Oxford

#isle of crete #amulet #chalcedony #cupid #stonework #archaeology #ancient living #ancient craft #ancient cultures #relic #amulets #ancient beliefs #ashmolean museum #deity #prehistoric #prehistory

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vugnasmineralblog · 9 months

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Chrysocholla

Added!

Chalcedony & Chrysocolla | Los Azules Mine, Quebrada San Miguel, Copiapó Province, Atacama Region, Chile

#userrequest #Chrysocolla #Chalcedony #minerals #crystals #geology #mineral

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mineralsrocksandfossiltalks · 6 months

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FOSSIL FRIDAY

Today we will talk about Petrified Wood!

One of the most common fossils, petrified wood is is tree or tree-like wood that has either been fossilized through replacement or permineralization. Usually, the organic material is replicated by silica (quartz or it's microcrystalline forms opal or chalcedony).

Petrified wood forms when woody plants are buried in saturated sediments with dissolved minerals in solution. The lack of oxygen slows decay and allows fossilization to occur.

Below are petrified wood and cycad specimens I have collected over the years from various localities I have worked at. All come from Late Jurassic sites.

The first is from the Salt Wash Member of the Morrison Formation in northwestern Colorado. It has been replaced by silica, most likely the microcrystalline quartz form, chalcedony.

The second is from the same location and has definitely been replaced by chalcedony. In this case, it looks to be the "flint" variety.

The third photo contains pieces of of wood from the Late Jurassic Swift Formation in northwest central Montana (It's a huge state. I need to be that weirdly specific). These are partially petrified and partially coalified. They still retain some of the original organic material which leaves a black residue on the fingers.

The fourth photograph are pieces that came from the Brushy Basin Member of the Morrison Formation in the San Rafael Swell of Utah. These have been permineralized by quartz.

Finally, the last two show cycads, a type of woody plant that was a prominent part of the Mesozoic woodlands and prairies. These specimens came from the same Salt Wash site as the first two tree specimens. These have also been replaced by chalcedony.