geode

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geode

ge·ode

(jē′ōd′)

A hollow, usually spheroidal rock with crystals lining the inside wall.

[French géode, from Latin geōdēs, a precious stone, from Greek, earthlike : gē, earth + -ōdēs, adj. suff.; see collodion.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

geode

(ˈdʒiːəʊd)

(Geological Science) a cavity, usually lined with crystals, within a rock mass or nodule

[C17: from Latin geōdēs a precious stone, from Greek: earthlike; see geo-, -ode¹]

geodic adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ge•ode

(ˈdʒi oʊd)

n.

1. a hollow concretionary or nodular stone often lined with crystals.

2. the hollow or cavity of this.

[1670–80; < French géode < Latin geōdēs < Greek geṓdēs earthlike. See geo-, -ode¹]

geode

ge·ode

(jē′ōd′)

A small, hollow, usually rounded rock lined on the inside with inward-pointing crystals. Geodes form when mineral-rich water entering a cavity in a rock undergoes a sudden change in pressure or temperature, causing crystals to form from the solution and line the cavity's walls.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

geode

A hollow nodule of rock lined inside with crystals.

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Noun

geode - (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals

mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them

nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)

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References in periodicals archive ?

For the 'Pearl Geode Collection', they are sliced in half and each side is hollowed out, while for the 'Finestrino Collection' a concave opening is made into the interior of whole cultured pearls, and for the 'Grotto Collection' the cultured pearls are carved to create an opening that goes all the way through them (Figure 37).

Gem-set cultured pearls

If you double the recipe, you can make several geodes. Have fun, and maybe one day you will find a real geode!

How to make your own geode

Spirit Geode Trees will be one of the featured products when the website is launched.

Sacred Apothecary Schedules Website Launch Prior to Black Friday

Needle-felting several colors into a ball - or into one of Adams' geodes - provides another avenue for surprise when the ball or geode is cut open.

Felting transforms raw material into work of art

Beautiful crystal-lined geodes may be seen in museum collections around the world, and crystal clusters broken out of geodes are highly popular with mineral collectors.

The Sakoany celestine deposit: Mahajanga Province, Madagascar

He has a large collection of 190 million-years-old Amethyst geode and Ammonite, 144 million years old wood fossils as well as Gryphaea and 190 million years old chambered nautilus.

Palaeontology enthusiast Sathya boasts of priceless possessions

Stefan Hafner, the Italian jewellery house of extraordinary calibre, unveiled three glittering new collections -- Lunari, Geode and Young Chic.

Stefan Hafner unveils new jewellery range

Among their finds is a 3,500-pound thunder egg, which Andruss said is the world's largest geode, now on display at the Rice Northwest Museum of Rocks and Minerals in Hillsboro.

ROCK HOUNDS

The cave, known as a geode (hollow crystal-lined rock), is the largest ever found in the world.

Crystal Cave

Amethyst-lined geodes occur in great numbers at certain horizons in Lower Cretaceous basalts in the Parana Basin.

"Skunk" calcite: mineral paragenesis in an amethyst geode from Ametista, Rio Grande do Sul, Brazil

Since 1964, a roadout in central Kentucky has been producing thousands of quartz geodes containing a variety of minerals including extraordinary specimens of millerite, jamborite (?) and unusual forms of pyrite.