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wardsci.com 800-962-2660 Limonite FeO • OH • nH2O Crystallography: Not crystallized a mineral colloid. Usually stalactitic botryoidal or mammillary; also fibrous massive earthy. Physical Properties: Cleavage: None apparent. Hardness: 5.0-5.5. Spec...

wardsci.com 800-962-2660 Chromite Fe+2 Cr2 O4 (Spinel Group) Crystallography: Isometric; 4/m32/m. Habit octahedral but crystals small and rare; most often granular to compact; massive. Physical Properties: Cleavage: None. Fracture uneven; brittle....

wardsci.com 800-962-2660 Sphalerite (ZnFe) 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 Pr...

+ward’ssciencewardsci.com800-962-2660 Azurite Cu3 (CO3)2 (OH)2 Crystallography: Monoclinic; 2/m. Habit varies; crystals commonly complex and malformed. Also massive. Physical Properties: Cleavage: {011} perfect {100} fair. Fracture conchoidal brit...

+ward’ssciencewardsci.com800-962-2660 Bornite (NaK) AlSi3 O8 (Feldspar Group) Crystallography: Orthorhombic - dipyramidal (2/m 2/m 2/m) Crystals rare; commonly massive. Physical Properties: Cleavage: None. Fracture small conchoidal uneven; brittle...

wardsci.com 800-962-2660 Chalcopyrite Cu Fe S2 Crystallography: Tetragonal; 42m. Usually massive; crystals commonly tetrahedral in aspect with the disphenoid. Physical Properties: Cleavage: Indistinct. Fracture uneven; brittle. Hardness: 3.5-4.0. ...

+ward’ssciencewardsci.com800-962-2660 Goethite Fe+3 O (OH) (See also Limonite) Crystallography: Orthorhombic; 2/m2/m2/m. Acicular or rarely in distinct prismatic vertically striated crystals. Also massive reniform stalactitic or in radiating fibro...

ward’s sciencewardsci.com800-962-2660 Hematite Fe2 O Crystallography: Hexagonal -R; 32/m. Crystals thick to thin tabular on {0001}; more rarely rhombohe- dral. Also micaceous to platy botryoidal to reniform and commonly earthy. Physical Properties...

+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: Dark ...

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...

ward’s sciencewardsci.com800-962-2660 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 and...

+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....

ward’s sciencewardsci.com800-962-2660 Bauxite Al (OH)3/AlO • OH Crystallography: A mixture; often pisolitic in round concretionary grains and also earthy massive. Physical Properties: Cleavage: None; uneven fracture. Hardness: 1.0-3.0. Specific Gr...

+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 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 ...

+ward’ssciencewardsci.com800-962-2660 Malachite Cu2 (CO3) (OH)2 Crystallography: Monoclinic; 2/m. Rarely in distinct crystals; usually prismatic or fine acicular. Commonly in radiating fibers forming botryoidal or stalactitic masses. Also granular...