CATALOGUE OF GEMS AND PRECIOUS STONES. 191 



Mohave moonstone = translucent, lilac-tinted chalecedony from the Mohave Desert, 

 California. 



Moldavite= dark-green to black glass resembling obsidian. 



Monazite= cerium phosphate and other rare-earth elements. 



Money stone=local name in Pennsylvania for rutile. 



Montana agate=moss agate from Montana. 



Montana jet=obsidian, from Yellowstone Park. 



Montana ruby=garnet. 



Montana sapphire=corundum; generally applied to dark-blue or greenish-blue 

 sapphire (compare river sapphire). 



Mont Blanc ruby=quartz. 



Moonstone=feldspar (usually oligoclase or the adularia variety of orthoclase) showing 

 a pearly opalescence; also commonly but erroneously applied to some white er 

 gray chalcedony and to satin spar (gypsum). 



Mora diamond=probably quartz crystal. 



Morganite= rose-colored beryl from Madagascar. 



Moriah stone =granular and spotted verd antique (serpentine). 



Morion=deep-black almost opaque smoky quartz. 



Moroxite= deep-green or blue-green apatite. 



Mosaic agate=brecciated Mexican onyx. 



Moss agate = chalcedony with greenish mosslike or treelike inclusions. 



Moss jasper=opaque and translucent chalcedony crowded full with mosslike mark- 

 ings. 



Moss opal=milky opal with black mosslike dendritic inclusions. 



Mother of emerald = prase (quartz). 



Mother-of-opal=rock matrix containing minute disseminated specks of precious opal. 



Mother-of-pearl = the hard iridescent internal layer of various shells. 



Mountain mahogany=banded obsidian. 



Midler's glass=hyalite. 



Myrickite=agate or chalcedony containing bright-red inclusions of cinnabar, from 

 the Death Valley region, California. 



N. 

 Nacre = mother-of-pearl . 



Natrolite= zeolite, aluminum and sodium hydrous silicate. 

 Needle stone =sagenite (quartz). 

 Nephelite=aluminum, sodium, and calcium silicate. 

 Nephrite=true jade, a tough compact fine-grained tremolite (white) or actinolite 



(green). 

 Nevada diamond=obsidian, artificially decolorized. 



New rock=bone turquoise (in distinction from "old rock"=true turquoise). 

 New Zealand greenstone=serpentine, richly colored, from New Zealand; also jade 



or nephrite from New Zealand . 

 Nicolo=onyx with a black or brown base and a bluish-white thicker wavy, top layer. 

 Nigrine= dark-brown to black rutile with some iron. 

 Noble opal = precious opal. 

 Novaeulite=fine-grained hard chalcedonic silica. 



O. 



Obsidian=a glassy form of lava. 



Ocean spray =satin spar (gypsum). 



Occidental agate=agato less perfect than oriental agate. 



Occidental amethyst=true amethyst (quartz). 



Occidental cat's-eye=quartz cat's-eye. 



