Igneous Rocks

wardsci.com 800-962-2660 Peridotite Type: Igneous; intrusive. Texture/Appearance: Medium to coarse-grained; massive, granular, sometimes porphyritic. Color: Medium gray to greenish-gray. Mineralogy/Chemistry: Ultramafic, with mafic minerals greate...

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+ward’ssciencewardsci.com800-962-2660 Anorthosite Type: Igneous; intrusive. Texture/Appearance: Medium to coarse-grained, equigranular with elongated tabular plagioclase. Color: Dark gray to bluish-gray, sometimes lighter shades. Mineralogy/Chemis...

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wardsci.com 800-962-2660 Marble Type: Metamorphic; regional and contact. Texture/Appearance: Fine to coarse-grained; granoblastic to saccharoidal. May appear patched or with streaks or banding that is deformed. Color: Variable, commonly white, pin...

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+ward’ssciencewardsci.com800-962-2660 Skarn Type: Metamorphic; contact. Texture/Appearance: Most often coarse-grained and granoblastic with no foliation. Massive structure with zones of mineral concentration. Color: Varies with mineralogy, but usu...

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+ward’ssciencewardsci.com800-962-2660 Augite (Ca,Na) (Mg,Fe,Al,Ti) (Si,Al)2 O6 (Pyroxene Group) Crystallography: Monoclinic; 2/m. Commonly prismatic crystals with rectangular cross-sections, or in granular crystalline masses. Physical Properties: ...

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+ward’ssciencewardsci.com800-962-2660 Schorl (Tourmaline Group) Na Fe3+2 Al6 (BO3)3 Si6 O18 (OH)4 Crystallography: Hexagonal -R; 3m. Usually in prismatic crystals with rounded triangular cross- section due to prominent trigonal prism and subordina...

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wardsci.com 800-962-2660 Rhyolite Type: Igneous; extrusive. Texture/Appearance: Fine-grained, cryptocrystalline (and glassy) to microcrystalline; often porphyritic. May show flow banding. Color: Light colored; pink, gray, and purple. Mineralogy/Ch...

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wardsci.com 800-962-2660 Pyrrhotite Fe1-xS (x = 0 - 0.17) Crystallography: Monoclinic; 2/m (below about 250°C). Hexagonal; 6/m3/m2/m for high tempera- ture forms. Crystals rare, usually tabular to platy on {0001}. Also massive, granular. Physical ...

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+ward’ssciencewardsci.com800-962-2660 Basalt Type: Igneous; extrusive/intrusive. Texture/Appearance: Fine-grained intergranular plagioclase, pyroxene, and oxides; may contain interstitial glass. Structure massive with some vacuoles occurring. Colo...

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1 All About Elements: Lithium https://wardsci.com/store wardsci.com | 800-962-2660 2 3 Fun Facts About… Lithium 1. Elemental lithium can float in mineral oil. 2. Lithium was one of the elements produced during Big Bang Nucleosynthesis. The other t...

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+ward’ssciencewardsci.com800-962-2660 Andesite Type: Igneous; extrusive. Texture/Appearance: Generally fine-grained, aphanitic. Massive structure, often porphyritic with phenocrysts standing out in a vitreous or fine-grained groundmass. Color: Dar...

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wardsci.com 800-962-2660 Scoria Type: Igneous; extrusive (volcanic). Texture/Appearance: Fine-grained to glassy; highly vesicular (>50%). Usually heavier and more crystalline than pumice. Color: Dark reddish-brown to black. Mineralogy/Chemistry: B...

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+ward’ssciencewardsci.com800-962-2660 Obsidian Type: Igneous; extrusive Texture/Appearance: Glassy with rare microphenocrysts or spherulites; conchoidal fracture. Color: Shiny black to brown. Mineralogy/Chemistry: A natural glass or rhyolitic (fel...

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wardsci.com 800-962-2660 Forsterite Mg2 Si O4 (Olivine Group) Crystallography: Orthorhombic; 2/m2/m2/m. Rarely in small equidimensional or tabular crystals; usually in granular masses and as rounded grains. Physical Properties: Cleavage: {101} ind...

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ward’s sciencewardsci.com800-962-2660 Gabbro Type: Igneous; intrusive. Texture/Appearance: Granular; medium-grained. Color: Dark, medium gray, green-gray or brownish-gray. Mineralogy/Chemistry: Mafic; with essential plagioclase (50%-75%) and pyrox...

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ward’s sciencewardsci.com800-962-2660 Syenite Type: Igneous; intrusive. Texture/Appearance: Massive; medium to coarse-grained, often changing to pegmatitic. Appears speckled with dark patches, sometimes porphyritic; may show flowage. Color: Pale, ...

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