| magnesite |
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noun
- (mineralogy) A form of magnesium carbonate, MgCO?3, occuring as dolomite (with calcite) but is rarely found in the pure state.
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| magnetite |
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noun
- (mineralogy) A magnetic mineral, Fe3O4, previously used in the form of lodestone.
- (geology) One of the primary ores of iron.
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| malachite |
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noun
- (mineralogy) A bright green mineral, a basic copper carbonate, Cu2CO3(OH)2; one of the principal ores of copper.
- (colour) A mild green colour, like that of the mineral.
- <table><tr><td>malachite colour: </td><td bgcolor="
- 679267" width="80"> </td></tr></table>
adjective
- (colour) of a mild green colour, like that of the mineral.
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| manganite |
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noun - (geology) a dark gray mineral of manganese, MnO?(OH), found throughout North America and Europe
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| marcasite |
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noun
- (geology) a pale mineral, FeS?2
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| massive |
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adjective
- Of or pertaining to a large mass; weighty, heavy or bulky.
- A comet or asteroid appears to have ended the era of the dinosaurs.
- Much larger than normal:
- Compared to its counterparts from World War II, the Abrams main battle tank is truly .
- Of great significance or import; overwhelming:
- The enlightenment comprises shifts in many areas of Western thought.
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| melilite |
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noun memilite
- (geology) any mineral consisting of a solid solution of gehlenite (Ca2Al2SiO?7) and akermanite (Ca2MgSi?2O7)
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| mica |
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noun (uncountable)
- The name of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
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| micaceous |
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noun
- Of, pertaining to, consisting of, or containing mica.
- Resembling mica, laminated, sparkling.
- Sometimes used figuratively such as in, the book review was a micaceous example of perfection.
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| microcline |
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noun
- (mineralogy) A common feldspar of igneous, plutonic, and metamorphic rocks, made of potassium aluminum silicate, (<math>KAlSi?_3O_8</math>). Microcline is the main feldspar of granite. The bluish-green variety is called amazonstone, and is sometimes of gem quality. Used in ceramics, ceramic glazes, and as a scouring powder.
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| Millerite |
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noun
- (Christianity) One who followed the calculations of William Miller or his followers than the world would end October 22, 1844; when it didn't, the w:Great Disappointment occured. The subsequent denominations his movement spawned include the Adventists, Jehovah's Witnesses and the (w:Campbellite) w:Restorationism,, Restorationists.
- 1924 The voices of the Millerites were heard singing and shouting and exhorting each other to stand firm, and to see to it that their lamps were trimmed and burning, ready for the awful moment whenever it might come. Still - nothing happened! " Clara Endicott Sears, Days of Delusion - A Strange Bit of History, http://www.ellenwhite.org/delusion/daysof8.htm Chapter 8.
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| mineral |
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noun
- (geology) any naturally occuring inorganic material that has a (more or less) definite chemical composition and characteristic physical properties
- any inorganic material (as distinguished from animal or vegetable)
- any inorganic element that is essential to nutrition; a dietary mineral
- (British) mineral water
adjective
- of, related to, or containing minerals
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| mineralogy |
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noun
- The study or science of minerals.
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| mirabilite |
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noun - (mineralogy) a saline evaporite, consisting of sodium sulphate
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| molybdenite |
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noun - (mineralogy) a mineral, molybdenum disulfide MoS?2, that is the principal ore of molybdenum; it is structurally similar to graphite and has a similar look and feel
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| monazite |
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noun - (mineralogy) any of a range of reddish-brown minerals that are mixed phosphates of the lighter rare earth elements lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium and yttrium
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| montmorillonite |
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noun - (chemistry) any of a group of soft, clay-like silicate minerals having many industrial and technical uses
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| morganite |
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noun
- (mineralogy) A gemstone of pegmatite deposits. Morganite is a transparent pink variety of beryl.
- Chemical composition: Beryllium aluminum silicate, <math>Be_3AL_2Si_6O_18</math>
- Physical properties:
Moh's Hardness: 8.0
Specific gravity: 2.6-2.8
Color: Pink
Luster: Glassy, transparent
Fracture: Conchoidal
Cleavage: Poor basal
- Habit: Hexagonal - Dihexagonal bipyramidal
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| Muscovite |
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noun
- An inhabitant or a resident of Moscow
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