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Augite, also known as Augurite, is a common rock-forming pyroxene mineral with formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. The crystals are monoclinic and prismatic. Augite has two prominent cleavages, meeting at angles near 90 degrees.
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also pyroxene monoclinic common mineral crystals prismatic black luster formula ca na mg fe al ti si 2o6 references rocks
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Augite | Birefringence | δ = 0.026–0.039 | 1.00 | infobox |
| Augite | Category | Inosilicate minerals (single chain) | 1.00 | infobox |
| Augite | Cleavage | {110} good with 87° between {110} and {110}; parting on {100} and {010} | 1.00 | infobox |
| Augite | Color | Black, brown, greenish, violet-brown; in thin section, colorless to gray with zoning common | 1.00 | infobox |
| Augite | Crystal class | Prismatic (2/m) (same H-M symbol) | 1.00 | infobox |
| Augite | Crystal habit | Commonly as stubby prismatic crystals, also acicular, skeletal, dendritic | 1.00 | infobox |
| Augite | Crystal system | Monoclinic | 1.00 | infobox |
| Augite | Diaphaneity | Transparent to opaque | 1.00 | infobox |
| Augite | Formula | .mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:l… | 1.00 | infobox |
| Augite | Fracture | uneven to conchoidal | 1.00 | infobox |
| Augite | Group | Pyroxene group, clinopyroxene subgroup | 1.00 | infobox |
| Augite | IMA symbol | Aug | 1.00 | infobox |
| Augite | Luster | Vitreous, resinous to dull | 1.00 | infobox |
| Augite | Mohs scale hardness | 5.5 to 6 | 1.00 | infobox |
| Augite | Optical properties | Biaxial (+) | 1.00 | infobox |
| Augite | Pleochroism | X = pale green, pale brown, green, greenish yellow; Y = pale brown, pale yellow-green, violet; Z = pale green, grayish green, violet | 1.00 | infobox |
| Augite | Refractive index | nα = 1.680–1.735, nβ = 1.684–1.741, nγ = 1.706–1.774 | 1.00 | infobox |
| Augite | Space group | C2/c | 1.00 | infobox |
| Augite | Specific gravity | 3.19–3.56 | 1.00 | infobox |
| Augite | Streak | Greenish-white | 1.00 | infobox |
| Augite | Strunz classification | 9.DA.15 | 1.00 | infobox |
| Augite | Tenacity | brittle | 1.00 | infobox |
| Augite | Twinning | Simple or multiple on {100} and {001} | 1.00 | infobox |
| Augite | Unit cell | a = 9.699, b = 8.844 c = 5.272 [Å] β = 106.97°; Z = 4 | 1.00 | infobox |
| Augite | is a | function of temperature and pressure | 0.90 | text |
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