Chrysocolla: meaning, properties and lore

The mineral

Chrysocolla is a silicate mineral, a hydrated copper silicate, and it is a basic copper silicate that often contains some aluminum, so its composition is usually variable. Its chemical formula is given as Cu2H2Si2O5(OH)4, while Encyclopaedia Britannica gives the formula CuSiO3·2H2O.¹²⁵⁶

Chrysocolla has a Mohs hardness of 2–4 and a specific gravity of 2.0–2.2, which makes it a soft mineral. It has no cleavage, breaks with a conchoidal to uneven fracture, and is brittle.²³⁷⁸⁹

The colour of chrysocolla is caused by its copper content, and the blue of the mineral comes from Cu2+ ions. Chrysocolla is known for its vivid blue hue, and specimens with a fine green or bluish green colour may be used as ornamental stones.²⁴¹⁰¹

Chrysocolla belongs to the orthorhombic crystal system. It is never found in visible crystals and is almost always botryoidal, reniform, stalactitic, massive, or in crusts.²

Chrysocolla is a secondary alteration mineral that forms in the oxidation zone of copper deposits, in hydrothermal replacement deposits, and in igneous rocks. It frequently forms pseudomorphs after other minerals, especially azurite.²

Most chrysocolla comes from copper deposits in arid regions, and it is found worldwide. Notable localities include Kolwezi in Katanga, Congo, the Ray Mine and other Arizona copper mines, and the Lily Mine in Peru, where it occurs as crusts or masses in the upper parts of copper ore veins.²¹

History and lore

Theophrastus, the earliest Greek writer on precious stones, is recorded in the third century B.C. as saying that Cyprian emeralds from copper mines were chiefly used for soldering gold. This suggested to later readers that they were the mineral ancient writers called chrysocolla.³

Theophrastus and other ancient writers applied the term chrysocolla to various materials used in soldering gold. The name therefore covered more than one substance in antiquity.¹

Birthstone, zodiac and chakra links

Crystal practitioners link chrysocolla with the Throat Chakra and Heart Chakra, and this chakra link is a modern practitioner association rather than an ancient one. The same practitioners also link the stone with the numerical vibration 5.

Crystal practitioners link chrysocolla with the modern modern zodiac signs Taurus, Gemini and Virgo, and this modern modern zodiac link is modern. No ancient modern modern zodiac list in the claims names the stone.

What crystal practitioners say

Crystal healing practitioners regard chrysocolla as a calming and re-energising stone. They describe it as balancing the chakras and as a cleansing stone.

Believers hold that chrysocolla helps overcome fears and phobias by releasing negativity. Believers also hold that it reduces mental tension and encourages truthfulness and impartiality.

Chrysocolla is traditionally associated with meditation, intuition, psychic awareness, patience, acceptance, tolerance and sensitivity. Practitioners associate it with these qualities in quiet practice.

Energetic cleansing of chrysocolla is best done with dry methods such as moonlight, sound, or visualisation rather than water, according to crystal practitioners.

What testing has found

Researchers at the Gemological Institute of America tested chalcedony that was sold as blue and found that its colour could come from chrysocolla inclusions. Raman spectroscopy and energy-dispersive X-ray fluorescence identified the inclusions, which appear as greenish blue inclusions alongside malachite and native copper.⁹

Tests at the Gemological Institute of America found that copper-dyed chalcedony had copper concentrated at the surface, and the ratio of silicon to copper was far higher than in natural blue chalcedony. The study's authors note that further verification is needed before these methods can be applied to other dyed chalcedonies.⁴

Gems & Gemology reported that chrysocolla gem silica can be separated from glass imitations by its FTIR reflectance spectrum, which lacks the glass band near 1065 cm–1. Raman and FTIR analysis of another blue stone showed a hardened polymer, polymethyl methacrylate, consistent with stabilisation by impregnation.⁸⁷