I 6 1 66 ' F l 0u r- fided P rifm » flatl 7 acuminated by four planes which are fet on the lateral planes. foliated zeolite. , A 6 l' Short and obIic l ue four-fided prifm, in which the acute edges, and angles on the obtufe fdges are truncated Fig. 68. Six-flded prifm, trun. catcd on all its angles. CUBIC ?EOL)TE. 70. Cube, acuminated on the I a fir a 1 T by * hree planes ’ whi ch are fet on the lateral planes. Fig. ?lm Acute double eight, ded pyramid, acuminated on each extremity by four planes, which are placed on the alternate and alter- bating lateral edges. CROSS STONE. Fig- 72. Broad reftangular four-fided prifm, acu- edges planes, which are fet on die lateral c f lg ‘ 73-Twin cryftal, formed by the interfeftion 01 two or the preceding. felspar. exSSirfi* B /° ad , fl ?*f lded prifm, bevilled on both xtremities, the bevilling planes fet on the edge? formed by the meeting of the fmaller lateral planes, vili!?' 7 ^’ Y Cry y P ur "fided prifm, flatly be- ,he be,il;i,,s plancs fet “ MICA. Fig. 76. Equilateral fix-fided table. BASALTIC