| Mineral | EPIDOTE |
| Chemistry | Ca 2 (Fe 3+ Al) 3 [O|OH|SiO 4 |Si 2 O 7 ] |
| Class | Silicates |
| Uses | mineral specimens and rarely as a gemstone. |
| Color | Yellowish-Green Green brownish-Green black |
| Luster | Vitreous |
| Transparency | crystals are transparent to translucent. |
| CrystalSystem | Monoclinic |
| CrystalHabits | include long, somewhat prismatic or tabular crystals with a typically dominant pinacoid that the crystal is often flattened against.The terminations are wedge shaped or tappered pyramids.Many clusters show grooved slender crystals or acicular sprays.Also massive, fiberous or granular. |
| Fracture | good in one direction lengthwise. |
| Hardness | 6 |
| Characteristics | striated to the depth of grooves in some crystals. |
| Indicators | only one direction of cleavage, crystal habit, color and hardness. |
| IMAStatus | Approved |
| Discovered | 1801 |
| CellParameters | a = 8.9b = 5.63c = 10.2 β=115.4° |
| Ratio | a:b:c = 1.581 : 1 : 1.812 |
| OpticalType | Biaxial (-) |
| RI | n α =1.723 - 1.751 n β =1.730 - 1.784 n |
| Birefringence | δ=0.013 - 0.046 |
| SurfaceRelief | High |
| Synonyms | Acanthicone Acanthikon Acanticone Acanticonit Acanticonita Acanticonite Acantikonit Achmatit Achmatita Achmatite Aescherit Aescherita Aescherite Akanthicone Allochit Allochita Allochite Arendat Arendata Arendate Arendit |
| TypeLocality | Bourg d Oisans Isère Rhône- Alpes France |
| Strunz | 8/C.23-20 8 : Silicates C : Sorosilicateswith [Si2O7]6-without anions unfamiliar to tetraheders 23 : Epidote group |
| FolkLore | EPIDOTE: Said to enhance keen perceptions, stimulate participation & interaction, dispels criticalness & supplements personal power. It is said this mineral can provide for increase in that which it is attuned to (focused on). |
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