riebeckite


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Related to riebeckite: crocidolite

riebeckite

(rē`bĕkīt'): see amphiboleamphibole
, any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements.
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riebeckite

[′rē‚be‚kīt]
(mineralogy)
Na2(Fe,Mg)5Si8O22(OH)2 A blue or black monoclinic amphibole occurring as a primary constituent in some acid- or sodium-rich igneous rocks.
References in periodicals archive ?
Most quartz crystals have inclusions of black acicular riebeckite, or of golden astrophyllite, and some have free-standing, finger-thick rutile crystals on and below the quartz crystal faces.
The granite is generally grey to grayish white, essentially composed of perthitic feldspar, quartz and small amount of plagioclase and sodic minerals such as riebeckite and aegirine.
Standards used were almandine (Mg and Fe), apatite (Ca and P), tephroite (Mn), titanite (Ti) and fluorian riebeckite (F).
2] Riebeckite [Mathematical Expression Omitted] Talc [Mg.
At least six phases are recognizable: 1) basement rocks (oldest), 2) riebeckite aegirine grey granite, 3) biotite-hornblende pink granite, 4) acid dyke, 5) rhyolite "plug", and 6) basic dykes (youngest).