TABLE III. FOR DETERMINATION OF MINERALS. 439 



t Insoluble : fusible. 

 Hardness. Sp. gr. Cleavage. 



Albite, 177 6-0 2-6—2-7 One perf. ; two 



imperfect. 



Labradorite, 178 " 2-6—2*8 One perf.; one 



imperfect. 



Manganese spar, 258 6*0 — 7*0 3-4 — 3-7 One perfect. 



Axinite, 190 6-5—7-0 3*2—3-3 Imperfect. 



JJnfusible. 



Kyanite, 173 5-0—7-0 3-5—3-7 Lat. distinct. 



Sillimanite, 172 7-0—7-5 3-2—3-3 Diagonal perf.!! 



6. CRYSTALS HEXAGONAL OR RHOMBOHEDRAL. 

 1. Luster unmetallic. 



* Soluble. 



Nitrate of soda, 



103 1-5- 



-2-0 2-0—2-1 Rhomb, perf. 



Coquimbite, 



256 " 



Hexag. imperf. 





t Insoluble : infusible. 



Brucite, 



126 1-5 



2-35 Foliated ! 



Mica, (hexagonal) 193 2*0- 



-2-5 2-8—3-1 Foliated!! 



Calc spar, 



115 2-5- 



_3-5 2-5—2-8 Rhomb, peif ! 



Diallogite, 



26J 3*5 



3-5—3-6 Rhombohedral. 



Magnesite, 



124 30- 



-4-0 2-8—3-0 Rhomb, perf. 



Ankerite, 



120 " 



2-9—3-2 Rhomb, peif. 



Dolomite, 



118 3*5- 



-4-0 3-5—4-0 Rhomb, peif. 



Spathic iron, 



247 



3-7—3-9 Rhomb, perf. 



Alum stone, 



129 5-0 



2-6 — 2-8 Basal, near perC 



Dioptase, 



301 " 



3.2—3-3 Rhombohedral. 



Quartz, 



132 7-0 



2-6 — 2-7 Imperfect. 



Sapphire, 



158 9-0 



3-9 Basal, perf. 





J Insoluble : fusible, without fumes. 



Chlorite, 



145 1-5- 



-2-0 2-6—2-9 Foliated! 



Chabazite, 



169 40- 



-4-5 2*0 — 2-2 Rhombohed.ina. 



Apatite, 



120 5-0 



3*0 — 3*3 Indistinct. 



Nepheline, 



179 5*5- 



_6-0 2*4—2*7 Imperfect. 



Tourmaline, 



187 7*0- 



-8-0 3*0 — 3*1 Indistinct. 



Beryl, 



197 7-5- 



-8*0 2 6—2-8 Basal, indistinct. 



