CATALOGUE OF GEMS AND PRECIOUS STONES. 185 



Crocidolite=fibrous hornblende of a bluish or greenish color, iron and magnesium 

 hydrous silicate. The altered form consists of silica colored yellow and brown with 

 oxide of iron and is called tiger-eye. 



Cross stone=chiastolite (andalusite) ; also staurolite. 



Crystal=colorless transparent quartz; also artificial flint glass. 



Cupid's darts= quartz crystal with needle-like inclusions of goethite. 



Cyanite=kyanite. 



Cymophane=chrysoberyl having a bright spot of light which seems to float over the 

 surface as the stone is moved. 



Cyprine=sky-blue vesuvianite. 



Damourite=compact mica, a result of the alteration of some preexisting mineral. 



Danburite= calcium borosilicate. 



Datolite=compact massive calcium hydroborosilicate. 



Dauphine diamond =rock crystal (quartz). 



Davidsonite=greenish-yellow beryl from vicinity of Aberdeen, Scotland. 



Delawarite=aventurine feldspar from Delaware County, Pennsylvania. 



Demantoid=olive-green, brown, blackish-green, or light-green grossularite (garnet) 



from the Ural Mountains, Russia. 

 Dendrite=having the form of a tree. 

 Dendritic agate=mocha stone and moss agate. 

 Diallage= foliated variety of diopside. 

 Diamond=carbon, in isometric crystals. 

 Diaspore=aluminum hydrous oxide. 

 Dichroite = cordierite . 



Diopside=calcium and magnesium silicate (pyroxene). 

 Dioptase=green hydrous silicate of copper. 

 Disthene=kyanite. 

 Doublet= consists of a real gem cemented to a piece of glass cut and colored to imitate 



the real stone. 

 Dravite= brown tourmaline. 



Drop of water=rounded (water-worn), colorless, and transparent pebble of topaz. 

 Dumortierite=blue or lavender aluminum hydroborosilicate. 

 Dysluite=yellow or grayish-brown spinel. 



E. 

 Edisonite=mottled blue turquoise. 



Egyptian jasper=banded yellow, red, brown, or black jasper. 

 Egyptian pebble =Egyptian jasper. 



Elaeolite= aluminum, sodium, and potassium silicate. Same as nephelite. 

 Eldoradoite=iridescent quartz from Eldorado County, California. 

 Elie ruby=red pyrope (garnet) from Elie in Fifeshire, Scotland. 

 Emerald=green beryl; also improperly applied to any green stone. 

 Emerald copper=dioptase. 

 Emerald malachite =dioptase. 

 Emeraldine=chalcedony artificially colored green. 



Emeralite=green and bluish-green tourmaline from San Diego County, California. 

 Emerandine = dioptase . 



Enhydros=hollow nodules of chalcedony partly filled with water. 

 Enstatite=magnesium silicate. 



Epidote=greenish hydrous aluminum, iron, and calcium silicate. 

 E8Sonite=yellow variety of grossularite (garnet). 

 Euclase=bluish or greenish hydrous aluminum and beryllium silicate. 

 Evening emerald=peridot. 



