You Searched For: Metamorphic+Rocks

wardsci.com 800-962-2660 Hornblende (CaNa)2-3 (MgFeAl)5 SI6 (SiAl)2 O22 (OH)2 (Amphibole Group) Crystallography: Monoclinic: 2/m. Crystals prismatic usually terminated by {011}. May be columnar to fibrous; coarse-to fine-granular. Physical Propert...

+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 usua...

+ward’ssciencewardsci.com800-962-2660 Schist Type: Metamorphic; regional. Texture/Appearance: Fine to coarse-grained strongly foliated. Granoblastic grading into porphyrob- lastic with mineral segregation banding usually present. Individual minera...

Almandine Fe3+2 Al2 (SiO4)3 (Garnet Group) Crystallography: Isometric; 4/m32/m. common forms are dodecahedron and trapezohedron. Also massive granular. Physical Properties: Cleavage: Not prominent; {110} parting sometimes distinct. Fracture subcon...

+ward’ssciencewardsci.com800-962-2660 Biotite K (Mg Fe+2)3 (Al Fe+3) Si3 O10 (OHF)2 (Mica Group) Crystallography: Monoclinic; 2/m. Usually in irregular foliated masses and rarely in tabular or short prismatic crystals. Physical Properties: Cleavag...

ward’s sciencewardsci.com800-962-2660 Graphite C Crystallography: Hexagonal; 6/m2/m2/m. Usually in foliated or scaly masses but may be radiated or granular. Crystals tabular of hexagonal outline with prominent basal plane. Physical Properties: Cle...

+ward’ssciencewardsci.com800-962-2660 Magnetite Fe+2Fe2+3O4 (Spinel Group) Crystallography: Isometric; 4/m32/m. Frequently in octahedral crystals; rarely dodecahedral. Commonly coarse-to fine-grained granular massive. Physical Properties: Cleavage...

+ward’ssciencewardsci.com800-962-2660 Staurolite (Fe+2 Mg Zn)2 Al9 (Si Al)4 O22 (OH)2 Crystallography: Monoclinic (pseudo-orthorhombic); 2/m. Crystals prismatic with common forms {110} {001} and {101}. Cruciform twins very common (at nearly 90° an...

+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...

+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 ...

+ward’ssciencewardsci.com800-962-2660 Gneiss Type: Metamorphic; regional. Texture/Appearance: Foliated often with distinct banding (segregation) of minerals; some preferred orientation in micas (platy) or hornblende (prismatic crystals). Medium to...

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 pink ...

wardsci.com 800-962-2660 Slate Type: Metamorphic; regional. Texture/Appearance: Fine-grained; lacks mineral segregation banding displays rock cleavage in one direction. Surface may appear somewhat smooth and shiny. Color: Various including dark gr...

+ward’ssciencewardsci.com800-962-2660 Amphibolite Type: Metamorphic; regional. Texture/Appearance: Massive to foliated; gneissic to schistose. Color: Black to dark-green often speckled with white. Mineralogy/Chemistry: Mafic; composed primarily of...

wardsci.com 800-962-2660 Serpentinite Type: Metamorphic; regional. Texture/Appearance: Fine to coarse-grained lamellar or mesh-like; massive with frequent zonations and veins. Color: Dark green to black. Mineralogy/Chemistry: Ultramafic; composed ...

ward’s sciencewardsci.com800-962-2660 Hornfels Type: Metamorphic regional. Texture/Appearance: Homogeneous; dense fine-grained. Granoblastic; may have porphyroblasts or any of the minerals present. Color: Varies; light to dark. May be pink brown g...