You Searched For: Metamorphic+Rocks
65 results were found
Gneiss
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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 t...
Hornblende
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Hornblende (Ca,Na)2-3 (Mg,Fe,Al)5 SI6 (Si,Al)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 Pro...
Greenstone
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Greenstone Type:
Metamorphic; regional. Texture/Appearance:
Fine-grained, massive or compact; generally non-schistose. Color:
Dark, green. Mineralogy/Chemistry:
Mainly composed of chlorite, actinolite, epidote...
Hornfels
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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, brow...
Schorl
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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...
Staurolite
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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 9...
Amphibolite
/www.boreal.com/images/Amphibolite.pdf
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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...
Anorthite
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Anorthite CaAl2Si2O8(An90-100) (Feldspar Group) (see also Plagioclase) Crystallography:
Triclinic; 1. Crystals usually prismatic parallel to c-axis; twinning as in albite. Commonly massive, cleavable, with gra...
Biotite
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Biotite K (Mg, Fe+2)3 (Al, Fe+3) Si3 O10 (OH,F)2 (Mica Group) Crystallography: Monoclinic; 2/m. Usually in irregular foliated masses, and rarely in tabular or short prismatic crystals. Physical Properties:
Cle...
Mealworms and Darkling Beetles
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Conditions for Customer Ownership We hold permits allowing us to transport these organisms. To access permit conditions, click here. Never purchase living specimens without having a disposition strategy in place. There are currently no USDA permit...
Corundum
/www.boreal.com/images/Corundum.pdf
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Corundum Al2O3 Crystallography:
Hexagonal-R; 32/m. Crystals commonly tabular on {0001} or prismatic {1120}; often rude barrel-shaped crystals. Usually massive; coarse or fine granular.
Physical Properties: Cle...
Graphite
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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: C...
Sphalerite
/www.boreal.com/images/Sphalerite.pdf
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Sphalerite (Zn,Fe) S Crystallography:
Isometric; 43m. Crystals usually tetrahedral or dodecahedral and often distorted and complex; rough, curved faces common. Usually in cleavable masses, coarse to fine granular.
Physical...
BS Element of Month Carbon IA
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1
All About Elements: Carbon
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Fun Facts About… Carbon 1. Graphine, an allotrope of carbon, is the
strongest, thinnest, and best conductor of heat known to man. It was created by scientists using ordin...
Axolotls
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Conditions for Ownership Axolotls are restricted in Canada. Under no circumstances ...
Granite
/www.boreal.com/images/Granite.pdf
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Granite Type:
Igneous, intrusive. Texture/Appearance:
Massive, medium to coarse-grained; holocrystalline, sometimes porphyritic. Color:
White, light gray, pink, or red. Mineralogy/Chemistry:
Felsic; composed primarily of q...
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