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Aurichalcite

stalactitic formation of Aurichalcite ball-like aggregates. Very colorful. Bates Collection Locality Kelly Mine, Magdelena, New Mexico Dimensions 5 x 4 x 2 cm.

Emerald with Calcite - Coscuez Mine, Boyaca Dept., Colombia

Emerald with Calcite from Coscuez Mine, Boyaca Dept., Colombia Credit: The Arkenstone Amazing Geologist

Nature and more -  libutron:  Sphalerite and Quartz | ©Geokrazy Minerals 2n Sovietskiy Mine, DalNegorsk, Primorskiy Kray, Russia

Nature and more - libutron: Sphalerite and Quartz

Variscita

Utahlite - A massive nodule of top-quality gem Variscite with excellent color from a classic U. locality for the species. Lapidaries use it when it is of this super quality to make jewelry.

"GeoPicture of the week: Tree fossil with opal growth rings -- This is an very rare sample: opal can be fairly common in petrified wood, but this is a fire opal, which makes it so much more valuable. …So how did this magnificent opalized tree came to be? Initially, water filled the cracks and empty spaces of the source fossil, and the silica content in the water hardened and turned into opal or chalcedony."

sun-hawk submitted: Amazing Rare Opalized Wood Boulder Opal with Bright Emerald Green and Blue Growth Rings.

Geology Rocks [!]  Full disclosure: I am NOT the author of the great caption above. It's from a previous pinner.

Poster of rock & minerals, showing classification. I NEED this for my room. That way I can dream about earths materials in my sleep. - blast of color which makes it easy to fall in love with rocks!

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