Orthorhombic Crystal System I
The Brachy Pinacoid. The Macro Pinacoid. The Basic Pinacoid. From the brachydomes (~a : b : mc) (or from the primary brachydome (~a : b : c), for that matter), we can derive the brachy pinacoid (~a : b : ~c) ({010}), by letting m (which equals 1 in the primary brachydome) become infinite. It consists of two vertical faces parallel to each other ...