accessory minerals

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• accessory minerals — plural noun Minerals whose presence or absence is not considered when a type of rock is given a name • • • Main Entry: ↑access …   Useful english dictionary

• accessory — [ak ses′ər ē, əkses′ər ē; ] also [ ə ses′ər ē] adj. [ML accessorius < L accessus, pp. of accedere, ACCEDE] 1. extra; additional; helping in a secondary or subordinate way 2. Geol. occurring in minor amounts in a specified rock; nonessential… …   English World dictionary

• accessory mineral —       any mineral in an igneous rock not essential to the naming of the rock. When it is present in small amounts, as is common, it is called a minor accessory. If the amount is greater or is of special significance, the mineral is called a… …   Universalium

• accessory — [[t]ækse̱səri[/t]] accessories 1) N COUNT: usu pl Accessories are items of equipment that are not usually essential, but which can be used with or added to something else in order to make it more efficient, useful, or decorative. ...an exclusive… …   English dictionary

• accessory — /əkˈsɛsəri / (say uhk sesuhree) noun (plural accessories) 1. a subordinate part or object; something added or attached for convenience, attractiveness, etc., such as a spotlight, heater, driving mirror, etc., for a vehicle. 2. (plural) the… …  

• essential minerals — plural noun Those whose presence is considered necessary to entitle a rock to the name it bears, opp to accessory minerals • • • Main Entry: ↑essence …   Useful english dictionary

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …   Wikipedia

• Widgiemooltha Komatiite — The Widgiemooltha Komatiite is a formation of komatiite in the Yilgarn Craton of Western Australia. Stratigraphy The stratigraphy of the Widgiemooltha Komatiite is well known to be part of the regional komatiite magmatic event also seen at the… …   Wikipedia

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• primary mineral — ▪ mineral classification       in an igneous rock, any mineral that formed during the original solidification (crystallization) of the rock. Primary minerals include both the essential minerals used to assign a classification name to the rock and …   Universalium