#gem geology

[amnhnyc]

Today’s Exhibit of the Day? It’s one of the largest amethyst geodes in the world! At about 13 ft (4 m) tall and 9,000 lbs (4,082 kg), this giant weighs about as much as three compact cars. It was born when molten magma poured from the Earth’s crust some 135 million years ago. While its dazzling purple crystals might catch your eye, this geode would have originally been composed of colorless quartz—its distinctive amethyst color deriving from millenia of natural radiation, heat, and trace contaminants. 

You can spot this geode, and other sparkly specimens, in the Museum’s Mignone Halls of Gems and Minerals. We're open daily from 10 am-5:30 pm! Plan your visit.

Photo: D. Finnin/ © AMNH

[gottastim]

blob_blobber on ig

[noosphe-re]

[geologyin-blog]

This is a library of a GEOLOGIST LOL

[retrogamingblog2]

Gem Carved Pokemon made by GeorgefBoutique

[dozydawn]

diamonds with garnet inclusions

[srlgemstone]

Lace Agate Pair

Every detail is beautiful. It has a mesmerizing dimensionality.

[geologystims]

Amethyst Heart | fasanaminerals on Instagram

[iloveabortions]

Vanadinite & Baryte | ACF Mine, Mibladen, Midelt Province, Drâa-Tafilalet Region, Morocco

[comfycat3]

I LOVE FLUORESCENCE !!!!!!!!

(kunzite yum i wanna chew on it like an ice cube)

[amnhnyc]

What are orbicules? This piece of granite comes from the Yilgarn Craton in Western Australia, an ancient piece of continental crust that began forming about 2.7 billion years ago. It’s one of the oldest enduring landmasses on Earth. Orbicules are the unusual ball-shaped, radial clusters of crystals that you can see on this rock. The diversity in the orbicules’ mineral composition and structure indicate that the conditions in the magma changed as they grew. See this specimen and more than 5,000 others in the Mignone Halls of Gems and Minerals. We're open daily from 10 am–5:30 pm! Plan your visit.

Photo: © AMNH

[gottastim]

koroit.opal.company on ig

[chrisrin]

AWWWW SHIIIT is that HOMESTUCK GEM FUSION DESIGNS??? 

[geologyin-blog]

True story!

[retrogamingblog2]

Gem Carved Pokemon made by GeorgefBoutique

[dozydawn]

“Color Change Spinel. These gems are usually so light-sensitive that they display different colors in each different lighting condition.

The most significant changes in color are from fluorescent light (blues, greys) to incandescent light (pinks, purples). Daylight almost always shows a mix of each gem’s inherent colors, which can be considered a third color. Today’s newer LED lighting sometimes shows a fourth color too.”