Epsomite
orthorhombic disphenoidic
this crystal shows 26 faces
pinacoid {010}      d = 1.000   2 faces
orthorhombic prism {110}      d = 0.700   4 faces
orthorhombic prism {310}      d = 0.800   4 faces
orthorhombic prism {101}      d = 1.100   4 faces
orthorhombic prism {012}      d = 1.100   4 faces
orthorhombic disphenoid {111}      d = 1.100   4 faces
orthorhombic disphenoid {121}      d = 1.050   4 faces
unit cell :  a = 11.96  b = 12.05  c = 6.88