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You Searched For: DIMCO-GRAY+CO

148  results were found

Dolomite

+ward’ssciencewardsci.com800-962-2660 Dolomite CaMg (CO₃)₂ Crystallography: Hexagonal-R; 3. Crystals usually unit rhombohedron or a steep rhombohedron and base; faces often curved. Twinning common. Also coarse granular cleavable masses to fine-gra...

Gabbro

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 pyroxen...

Chalcocite

+ward’ssciencewardsci.com800-962-2660 Chalcocite Cu2S Crystallography: Orthorhombic; 2/m2/m2/m (below 105°C); above 105°C hexagonal. Crystals uncommon usually small and tabular with hexagonal outline. More often fine-grained and massive. Physical ...

Anorthosite

+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/Chemistr...

Anothoclase

+ward’ssciencewardsci.com800-962-2660 Anorthoclase (Na K) AlSi3 O8 (Feldspar Group) Crystallography: Triclinic; 1. Twinning common. Physical Properties: Cleavage: Principle cleavage at right angles or very close to 90°. Fracture uneven; brittle. H...

Diorite

+ward’ssciencewardsci.com800-962-2660 Diorite Type: Igneous; intrusive. Texture/Appearance: Massive generally medium-to-coarse grained; subhedral equigranular to por- phyritic. Differences in color and grain size are common with orbicular structur...

Phyllite

+ward’ssciencewardsci.com800-962-2660 Phyllite Type: Metamorphic regional. Texture/Appearance: Very fine-grained showing strong schistosity; commonly displaying crenulated (wavy) cleavage. Generally coarser than slate. Cleavage surface exhibits a ...

Peridotite

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 greater t...

Galena

+ward’ssciencewardsci.com800-962-2660 Galena Pb S Crystallography: Isometric; 4/m32/m. Commonly cubic sometimes truncated by the octahedron; rarely decahedral and trisoctahedral. Also massive granular. Physical Properties: Cleavage: {001} perfect....

Montmorillonite

wardsci.com 800-962-2660 Montmorillonite (NaCa)0.3 (Al Mg)2 Si4 O10 (OH)2 • nH2O Crystallography: Monoclinic. Always in earthy masses; crystals not distinguishable. Physical Properties: Cleavage: None apparent; usually unctuous and plastic. Hardne...

Graywacke

wardsci.com 800-962-2660 Graywacke Type: Sedimentary; clastic. Texture/Appearance: Generally coarse-grained with angular to sub-angular poorly sorted grains in a clayey matrix. May show graded bedding; fossils are rare. Color: Gray to greenish-gra...

Siltstone

+ward’ssciencewardsci.com800-962-2660 Siltstone Type: Sedimentary; clastic. Texture/Appearance: Silt-sized (<1/16 mm) to very fine sand-sized particles; massive not laminated (no bedding planes) may exhibit significant clay or sand. Color: Tan gra...

Syenite

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 pin...

Pumice

+ward’ssciencewardsci.com800-962-2660 Pumice Type: Igneous; extrusive (pyroclastic). Texture/Appearance: Glassy vesicular foamy frothy. Very light-weight with numerous vacuoles (some varieties float in water). A natural glass froth in which the vo...

Nepheline

+ward’ssciencewardsci.com800-962-2660 Nepheline (NaK) AlSiO4 Crystallography: Hexagonal; 6. Rarely in small prismatic crystals with base; more commonly massive compact and in embedded grains. Physical Properties: Cleavage: {1010} distinct. Fractur...

Rhyolite

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/Chemi...
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