190 BULLETIN 118, UNITED STATES NATIONAL MUSEUM. 



Leelite=deep flesh-red ortlioclase, having a waxy luster. 



Lennilite=greenish feldspar from Lenni Mills, Delaware County, Pennsylvania. 



Leopardite=porphyry with black spots of manganese oxide. 



Lepidolite=mica, hydrous aluminum, lithium, and potassium silicate, with fluorine. 



Leuco sapphire = white sapphire. 



Lignite=brown coal showing the form and fiber of the original tree. 



Lintonite= zeolite, probably thomsonite, with alternating bands of green and red. 



Lithia emerald = green spodumene. 



Lithoxyle=wood opal showing woody structure. 



Lodestone= magnetite (iron oxide) which shows polarity. 



Love arrows =sagenite (quartz). 



Lucky stone=fairy stone (staurolite). 



Lumachelle=fire marble. 



Lydian stone =basanite (quartz). 



Lynx sapphire = water sapphire (cordierite) ; also very dark-blue sapphire. 



Lynx stone=cordierite. 



M. 

 Macle=chiastolite. 

 Madeira topaz = citrine quartz. 

 Magic stone=hydrophane. 

 Magnetite = black magnetic iron oxide. 

 Mahogany ore=compact mixture of iron and copper oxides. 

 Malachite=green hydrous copper carbonate. 

 Malacolite = diopside . 

 Male sapphire = deep-colored sapphire. 

 Marble=recrystallized limestone or dolomite. 

 Marcasite=iron sulphide, in orthorhombic crystals. The same iron sulphide, in 



isometric crystals, is pyrite. 

 Marekanite=mottled brown and black obsidian. 

 Mariposite=green compact micaceous aluminum, magnesium, and potassium hydrous 



silicate. 

 Marmorosch diamond = quartz crystal from Marmaros Comitat, Hungary. 

 Masculine = term applied to stones of a deep and rich color. 

 Matara diamond = colorless or faintly smoky zircon from Ceylon; the pale-brown 



zircons are sometimes decolorized by heat. 

 Matrix = rock surrounding mineral. 

 Meerschaum = sepiolite . 

 Melanite=dull-black andradite (garnet). 

 Menaccanite = ilmenite . 

 Menilite=grayish-brown banded, sometimes concretionary, opal from vicinity of 



Paris, France. 

 Mesolite= zeolite similar to thomsonite in composition, aluminum, calcium, sodium, 



and potassium hydrous silicate. 

 Mexican onyx=banded, mottled, or clouded travertine. 

 Mici=group of silicate minerals, containing aluminum, and potassium, with water, 



and other elements. 

 Microcline=potash feldspar in triclinic crystals, aluminum and potassium silicate. 

 Microlite= essentially a calcium tantalate. 

 Mineral turquoise = true turquoise. 

 Mocha agxte=translucent agate or chalcedony with brown, red, or black dendritic 



figures like trees or plants. 

 Mocha stone=chalcedony with brown, red, or black, treelike inclusions of manganese 



oxide. 



