Marlborough is famous for producing the world's finest chrysoprase, a semi-precious gem once coveted by Alexander the Great and Cleopatra.
12.
Chrysoprase is cryptocrystalline, which means that it is composed of crystals so fine that they cannot be seen as distinct particles under normal magnification.
13.
Dunlop's work is characterised by the use of semi-precious and precious gems, such as chalcedony, chrysoprase, lapidaries in Germany.
14.
In the Australian deposits, chrysoprase occurs as veins and nodules with brown goethite and other iron oxides in the magnesite-rich saprolite below an iron and silica cap.
15.
The chrysoprase and Ni silicate ore deposit in Szklary, Lower Silesia, Poland, was probably the biggest European chrysoprase occurrence and possibly also the biggest in the world.
16.
The chrysoprase and Ni silicate ore deposit in Szklary, Lower Silesia, Poland, was probably the biggest European chrysoprase occurrence and possibly also the biggest in the world.
17.
Unlike emerald which owes its green color to the presence of chromium, the color of chrysoprase is due to trace amounts of nickel compounds in the form of very small inclusions.
18.
Chrome chalcedony is similar in appearance to the better known chrysoprase, but differs in that whilst chrome chalcedony is colored by chromium ( as chromium ( III ) oxide ), chrysoprase is colored by nickel.
19.
Chrome chalcedony is similar in appearance to the better known chrysoprase, but differs in that whilst chrome chalcedony is colored by chromium ( as chromium ( III ) oxide ), chrysoprase is colored by nickel.
20.
Among Mesoamerican archaeologists, " jade " is sometimes used in a manner that does not differentiate between jadeite and other similar-looking, relatively hard greenstones such as albitite, omphacite, chrysoprase, and quartzite.
