Why is most chrysocolla sold in chalcedony?

Because pure chrysocolla is hardness 2 to 4 and far too friable to cut or wear. Where silica has infiltrated the material, hardness rises to around 6 or 7 and it becomes workable. That silicified material is properly chrysocolla in chalcedony, and the finest translucent examples are sold as gem silica.

Is chrysocolla toxic?

It is a copper mineral and carries the same cautions as malachite. As a polished silicified piece handled normally it is safe. As dust, in water, or in a direct-contact elixir it is not. Never soak it, never grind it without extraction, and wash your hands after handling raw material.

What does the name mean?

Gold glue, from the Greek chrysos and kolla. Theophrastus named it around 315 BCE after its use as a flux for soldering gold. It is one of the few stone names that records a technical use rather than an appearance or a place, which makes the earliest written reference to it metallurgical.

A mixture of chrysocolla, malachite and turquoise from the Timna valley in Israel, associated in popular accounts with King Solomon's mines, which is a romantic label rather than an established fact. The original deposit is largely worked out, and much material sold under the name now comes from elsewhere.

The finest translucent chrysocolla in chalcedony, an intense even blue-green, and among the most valuable chalcedonies there is. Arizona's copper belt produces the best material. Dyed chalcedony is sold in its place and rarely matches its combination of saturation and translucency.

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Greenstones & copper minerals · Green ray

Chrysocolla

Chrysocolla is a hydrated copper silicate, blue-green and soft enough to mark with a coin. Most of what is sold is chrysocolla in chalcedony, where silica has hardened the material into something workable. Its name is Greek, from chrysos for gold and kolla for glue, because it was used as a flux for soldering gold.

At a glance

Named by Theophrastus for its use as a gold solder, and usually sold hardened inside quartz.

Composition: hydrated copper silicate
Crystal system: Orthorhombic
Hardness: Mohs 3
Family: Greenstones & copper minerals
Colour ray: The green ray
Main sources: DR Congo, Israel (Eilat), Peru, Mexico, Arizona
Care: Very soft at 3 unless silicified. Copper-bearing: never in water you drink.

Themes

the voice copper green the soft stone hardened expression what needs support

What it actually is

A hydrated copper silicate with a variable formula, usually given as approximately (Cu,Al)2H2Si2O5(OH)4 nH2O, orthorhombic or amorphous, hardness 2 to 4 in pure form.

Pure chrysocolla is far too soft and friable to work, which is why almost all material on the market is silicified: chalcedony has infiltrated it, raising hardness to around 6 or 7 and making it cuttable. That material is properly called chrysocolla in chalcedony, and gem quality examples are sold as gem silica, which is among the most valuable chalcedonies.

Chrysocolla frequently occurs with malachite, azurite and turquoise in the oxidised zone above copper deposits, and mixed material containing several of these is common.

Eilat stone, from Israel, is a mixture of chrysocolla, malachite and turquoise.

Being copper-bearing, it carries the same safety cautions as malachite.

Where it comes from

The Democratic Republic of the Congo, Peru, Mexico, Chile and Arizona all produce chrysocolla, generally as a secondary mineral in copper mining districts.

Israel's Timna valley produced the Eilat stone historically, from ancient copper workings sometimes associated with King Solomon's mines, though that association is a romantic label rather than an established fact. The deposit is largely worked out and much material sold as Eilat stone now comes from elsewhere.

Arizona's copper belt produces the finest gem silica, particularly from the Inspiration mine near Miami, and that material commands high prices.

Because chrysocolla is a secondary copper mineral, its distribution tracks copper mining worldwide.

What the traditions claimed

Theophrastus named it around 315 BCE, and the name records a use rather than a meaning: chrysos and kolla, gold and glue, because copper minerals were used as a flux in soldering gold. That practical origin is unusual and worth knowing, since it means the earliest written reference to this stone is metallurgical.

Pliny repeats the name and describes the material.

Egyptian and Near Eastern use of blue-green copper minerals was extensive, but distinguishing chrysocolla from turquoise and malachite in ancient contexts is often impossible without analysis, so specific claims should be treated cautiously.

Modern practice reads chrysocolla as a stone of communication, particularly of expressing difficult feelings, and often calls it a stone of teaching and of women's speech. That reading is twentieth-century.

The teaching association has some appeal given the stone's actual history as a working material in a craft, but the connection is coincidental.

How it is worked with

The expression reading is the usable one and it sits close to amazonite and blue lace agate. Chrysocolla's specific modern brief is about saying things that are difficult rather than things that are merely awkward.

For anything you want to handle, buy chrysocolla in chalcedony rather than pure material. The silicified version is hard at 6 to 7, safe in water, and will survive a pocket; pure chrysocolla will not survive being looked at hard.

Gem silica is expensive and worth seeing once, since it is one of the most intensely coloured translucent stones there is.

For pure or mixed soft material, treat it as a specimen: keep it dry, do not soak it, and handle it as little as possible.

The copper cautions apply to all of it.

Buying it honestly

The main issue is what you are actually buying.

Most sold chrysocolla is chrysocolla in chalcedony, which is the good outcome. Pure chrysocolla is soft and friable and is often stabilised with resin.

Dyed howlite, dyed magnesite and dyed quartzite are sold in this colour range, and hardness distinguishes them.

Reconstituted material, powder in a binder, is common.

Eilat stone is genuine but the name is applied loosely to any chrysocolla and malachite mixture.

Gem silica is valuable enough to imitate, and dyed chalcedony appears in its place; genuine gem silica has an intense even blue-green with translucency that dyed material rarely matches.

Mixed copper-mineral rocks are sold under many invented trade names.

Handle with care

Copper-bearing: toxic as dust and in water. Never soak it, never make a direct-contact elixir, never grind without extraction. Pure material is soft at 3 and crumbles; silicified material is hard and safe to handle.

Perguntas para reflexão

What do I need to say that is difficult rather than merely awkward?
What in me only works because something harder is holding it together?
Where am I the soft material, and what is my chalcedony?

Follow the thread

🟢

Malachite

The copper carbonate it grows beside

🔵

Turquoise

The other copper blue-green, and the harder one

🔵

Azurite

The third of the copper trio

🪨

Greenstones & copper minerals

The family this stone belongs to

🟢

The green ray

The ray it carries

Frequently asked questions

: Because pure chrysocolla is hardness 2 to 4 and far too friable to cut or wear. Where silica has infiltrated the material, hardness rises to around 6 or 7 and it becomes workable. That silicified material is properly chrysocolla in chalcedony, and the finest translucent examples are sold as gem silica.
: It is a copper mineral and carries the same cautions as malachite. As a polished silicified piece handled normally it is safe. As dust, in water, or in a direct-contact elixir it is not. Never soak it, never grind it without extraction, and wash your hands after handling raw material.
: Gold glue, from the Greek chrysos and kolla. Theophrastus named it around 315 BCE after its use as a flux for soldering gold. It is one of the few stone names that records a technical use rather than an appearance or a place, which makes the earliest written reference to it metallurgical.
: A mixture of chrysocolla, malachite and turquoise from the Timna valley in Israel, associated in popular accounts with King Solomon's mines, which is a romantic label rather than an established fact. The original deposit is largely worked out, and much material sold under the name now comes from elsewhere.
: The finest translucent chrysocolla in chalcedony, an intense even blue-green, and among the most valuable chalcedonies there is. Arizona's copper belt produces the best material. Dyed chalcedony is sold in its place and rarely matches its combination of saturation and translucency.

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