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Chrysocolla exhibits a wide range of Mohs hardness ranging from 2 through 7, which is dependent on the amount of silica incorporated into the stone when it is forming. Generally, dark navy blue chrysocolla is too soft to be used in jewelry, while cyan, green, and blue-green chrysocolla can have a hardness approaching 6, similar to turquoise.
Eilat Stone (Hebrew: אבן אילת) is a gemstone that derives its name from the city of Eilat in Israel, where it was once mined. It is characterized by a green-blue heterogeneous mixture of several secondary copper minerals, including malachite , azurite , turquoise , pseudomalachite , and chrysocolla .
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel. Its color is normally apple-green, but varies from turquoise-like cyan to deep green. The darker varieties of chrysoprase are also referred to as prase.
The carbuncle was the first stone of the second row of the priestly breastplate and it represented Judah, and is also the eighth stone mentioned of the riches of the King of Tyre (Ezekiel 28:13). An imported object, not a native product, (Ezekiel 28:16); it is the third stone of the foundation of the celestial Jerusalem (Revelations 21:19).
Got it home and saw it had the name of American artist Charles Aysocki. I paid $60 and I think its value is much higher. Image credits: Is that Wired or Wonderful thing