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Pigeonite is a mineral in the clinopyroxene subgroup of the pyroxene group. It has a general formula of (Ca,Mg,Fe)(Mg,Fe)Si2O6. The calcium cation fraction can vary from 5% to 25%, with iron and magnesium making up the rest of the cations.
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augite mg fe clinopyroxene orthopyroxene plus igneous calcium pyroxene ca monoclinic mineral temperature evidence rocks present exsolution lamellae subgroup group
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Pigeonite | 2V angle | 0 – 30° measured | 1.00 | infobox |
| Pigeonite | Birefringence | δ = 0.021 – 0.030 | 1.00 | infobox |
| Pigeonite | Category | Inosilicate minerals (single chain) | 1.00 | infobox |
| Pigeonite | Cleavage | Good on {110}, (110) ^ (110) ~87° | 1.00 | infobox |
| Pigeonite | Color | Brown, greenish brown-black | 1.00 | infobox |
| Pigeonite | Crystal class | Prismatic (2/m) (same H-M symbol) | 1.00 | infobox |
| Pigeonite | Crystal habit | Prismatic crystals, to 1 cm; granular, massive. | 1.00 | infobox |
| Pigeonite | Crystal system | Monoclinic | 1.00 | infobox |
| Pigeonite | Dana classification | 65.01.01.04 | 1.00 | infobox |
| Pigeonite | Diaphaneity | Semitransparent | 1.00 | infobox |
| Pigeonite | Dispersion | weak to distinct | 1.00 | infobox |
| Pigeonite | 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 |
| Pigeonite | Fracture | Conchoidal | 1.00 | infobox |
| Pigeonite | Group | Pyroxene group, clinopyroxene subgroup | 1.00 | infobox |
| Pigeonite | IMA symbol | Pgt | 1.00 | infobox |
| Pigeonite | Luster | Vitreous to dull | 1.00 | infobox |
| Pigeonite | Mohs scale hardness | 6 | 1.00 | infobox |
| Pigeonite | Optical properties | Biaxial (+) | 1.00 | infobox |
| Pigeonite | Pleochroism | Weak to moderate; X = colorless, pale green, brown; Y = pale brown, pale brownish green, brownish pink; Z = colorless, pale green, pale yellow | 1.00 | infobox |
| Pigeonite | Refractive index | nα = 1.683 – 1.722 nβ = 1.684 - 1.722 nγ = 1.704 – 1.752 | 1.00 | infobox |
| Pigeonite | Space group | P21/c | 1.00 | infobox |
| Pigeonite | Specific gravity | 3.17 – 3.46 measured | 1.00 | infobox |
| Pigeonite | Streak | Grey white | 1.00 | infobox |
| Pigeonite | Strunz classification | 9.DA.10 | 1.00 | infobox |
| Pigeonite | Tenacity | Brittle | 1.00 | infobox |
| Pigeonite | Twinning | Commonly twinned simply or multiply on {100} or {001} | 1.00 | infobox |
| Pigeonite | Unit cell | a = 9.7, b = 8.95, c = 5.24 [Å]; β = 108.59°; Z = 4 | 1.00 | infobox |
| Pigeonite | is a | mineral in the clinopyroxene subgroup of the pyroxene group | 0.90 | text |
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