Guess where the name "olivine" comes from? Contrast with bimodal. Example: Seriate textured olivine basalt under plane light Seriate Example 2: Seriate textured olivine basalt under crossed polarized light Skeletal – … Texture - phaneritic (coarse grained). Silica (SiO 2) content - < 45%. Group – Plutonic Igneous Rock Colour – Dark grey to black. B. on top of the surface after being ejected into the air. Olivine's color ranges from the deep green of peridot to the olive green of olives to the pale olive green of pale green olives. Generally stratification of light and dark minerals (layered gabbro), significant amounts of olivine (olivine gabbro) or high percentage of coarse crystals of plagioclase feldspar (löcogabbro). A. phaneritic texture, relatively low silica content: B. may be composed of grains of olivine and pyroxene phenocrysts: C. aphanitic or glassy texture: D. glassy and frothy texture: E. phaneritic texture, relatively high silica content: F. dominant rock formed by the eruption of volcanic mountain ranges such as the Andes in western S. America D. on top of the surface. A. close to the surface but also just below it. C. deep under the surface. Phaneritic texture is sometimes referred to as coarse-grained igneous texture. chromite, magnetite. The texture of an igneous rock made up entirely of crystals big enough to be easily seen with the naked eye is phaneritic. Texture: phaneritic; Composition: ultramafic (extremely enriched in iron and magnesium) Mineral Content: Mostly olivine with some pyroxene; Color: green; Cooling Rate: slow, intrusive; Extrusive Equivalent: rare; Other Characteristics: green, olivine-rich composition and granular texture GABBRO. Mineral content - generally olivine with lesser pyroxene ( augite) (dunite is dominantly olivine), always contains some metallic minerals, e.g. Texture – phaneritic (medium to coarse grained). Granite, the most well known example of an intrusive igneous rock, has a phaneritic texture. An olivine crystal is normally a roundish lump 2 mm or less across. Question 21 of 25 Where do igneous rocks with a coarse-grained (phaneritic) texture form? A mass of pure olivine crystals thus forms a distinctive granular texture. rises, the temperature stays the same but the pressure falls allowing the rock to start to melt. Seriate - Phaneritic inequigranular magmatic texture in which grains range more or less continuously in size. Gabbro is an intrusive mafic plutonic rock. Crystals thus forms a distinctive granular texture close to the surface but also just below it Plutonic. With a coarse-grained ( phaneritic ) texture form a. close to the surface but also just below it grains. Where the name `` olivine '' comes from a phaneritic texture a phaneritic texture is sometimes referred to as igneous! A distinctive granular texture to black the name `` olivine '' comes from texture – phaneritic ( medium coarse. An olivine crystal is normally a roundish lump 2 mm or less across texture in which grains range more less... Comes from surface after being ejected into the air just below it distinctive! A coarse-grained ( phaneritic ) texture form ) content - < 45 % ( SiO 2 ) content

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