Axinite

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<tr> <td>Chemical formula</td><td>calcium aluminum boro-silicate, (Ca,Fe,Mn)₃Al₂BO₃Si₄O₁₂OH or Ca₂(Fe,Mn)Al₂BSi₄O₁₅(OH)</td> </tr> <tr> <td>Color</td><td>Reddish brown to yellow to colorless. Blue, violet, grey.</td> </tr><tr> <td>Crystal habit</td><td>Tabular, wedge shaped crystal</td> </tr><tr> <td>Crystal system</td><td>Triclinic</td> </tr><tr> <td>Cleavage</td><td>Good</td> </tr><tr> <td>Fracture</td><td>Conchoidal</td> </tr><tr> <td>Mohs Scale hardness</td><td>6.5-7</td> </tr><tr> <td>Luster</td><td>Vitreous</td> </tr><tr> <td>Refractive index</td><td>1.68-1.723</td> </tr><tr> <td>Pleochroism</td><td>Strong</td> </tr><tr> <td>Streak</td><td>White</td> </tr><tr> <td>Specific gravity</td><td>3.26-3.41</td> </tr>