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“Orthorhombic. Crystals resemble closely those of barite. Commonly tabular parallel to the base or prismatic parallel to the brachy- or macro-axis with prominent development of the domes. Crystals which are elongated parallel to the brachy-axis are frequently terminated in front by four faces in nearly equal development, consisting of 2 prism faces and 2 of the macrodome.” — Ford, 1912




William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 301


TIFF (full resolution)

2400×1768, 245.5 KiB

Large GIF

1024×754, 30.5 KiB

Medium GIF

640×471, 18.9 KiB

Small GIF

320×235, 8.2 KiB