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Mineral: Calcite
Description: Contact twin on {001}, triangular habit due to underdevelopment of prism faces
Location: La Sambre quarry, Landelies, Belgium
Author: Mark Holtkamp 2012; Michel Croisez, La cristallographie de la calcite à la carrière des Calcaires de la Sambre à Landelies, Publication 4M a.s.b.l., Montigny-le-Tilleul, Belgium, 2012
System: Trigonal, point group: -32/m
Cell: a: 1, b: 1, c: 854, alpha: 90, beta: , gamma: 120