SPARRY ANHYDRITE. 251 Fourth Subspecies. Sparry Anhydrite or Cube-Spar. Wurfelspath, Werner. Spathiger Karstenit, Hems. s. 124.—Spatlngcr Muriacit, Kar- s-ten, Tabel. s. 52.—Chaux sulphatec Anhydre laminaue, Hauy, Tabl. p. 10—Wurfelspath, Lenz, b. n. s. 94(5. External Characters. The principal colour is white, of which it exhibits the following varieties, viz. greyish, reddish, and yellowis l white: besides these colours, it also occasionally exhi bits the following, viz. dark ash-grey, brick, and pale rose red, pale honey-yellow, and colours intermediate between bluish-grey and violet-blue, and between brick-red and aurora-red. It occurs massive ; and crystallised in the following fi gures : .... 1. Rectangular four-sided prism * : it is sometimes so low as to form a four-sided table 2. Broad six-sided prism. 3. Eight-sided prism; or it may be viewed as the rec tangular four-sided prism, truncated on t ie a 4. Broad rectangular four-sided prism, acuminated o the extremities with four planes, whic i are 'e the lateral edges, and the apex of the acuminatum deeply truncated. Externally „ forra is a rectangular four-sided According to Bournon, its prumtne . with snuaro bases.
