4*22 TABLE I. FOR DETERMINATION OF MINERALS. 



Lapis Lazuli, 

 Feldspar, 



Albite, 



Labradorite, 



Chondrodite, 



Obsidian, 

 Manganese spar, 

 Petalite, 



Idocrase, 



Hardness, 

 196. 5-5—60 



176. 60 

 ":77. 6-0 



178. 60 



157. 5-5— 6-5 



341. 5-5— 6-5 

 239. 5-5—70 

 132. 60—6-5 



184. 6-5 



Prehnite, 



170. 60—6-5 



Epidote, 



182. 60—70 



Ppodumene, 



156. 6-5—70 



finite, 



190. 



Garnet, 



184. 6-5—7.5 



Boracite, 



126. 7-0 



lolite, 



190. 70 



Tourmaline, 



187. 7-0—8-0 



Euclase, 



199. 7-5 



JBeryl, 



107. 7-5-^8-0 



I ; dodec ; mas ; G 2-5 — 2-9 ; rich b; vit; trl— «p 

 Bl, fus, trl or op glass. 



IV ; cleav, mas ; G 2-3—2-6 ; wh, gyb, rb, bb, gnb, 

 p'ly, vit ; trp, strl ; mur, no action : Bl, fus dif, 

 bor trp glass. 



V ; cleav, mas ; G 2-6—2-7 ; w, gyh, gnh,rh, bh ; p'ly, 

 vit ; trp, strl ; mur, no action : Bl, fus dif ; flame 

 yellow; may generally be distinguished from 

 feldspar by its purer white color. 



V ; cleav, mas ; G 2-6 — 2-8 ; chatoyant, gy, gnh, bn, 

 rdh-bn : p'ly, vit ; strl ; hot mur decomp : Bl, 

 fus easily, colorless glass. Prim. 



IV ; gran mas ; G 3-1 — 3-2 r ywh, bnb-yw, rh, gnb 



vit, res ,- trp, strl; brittle : Bl, fus dif!! bor fus*, 



ywh-gn. Gran limestone. 

 Mas, like glass ; G 2-2 — 2-8 ; bk, gy, gn ; vit, p'ly 



Bl, fus. 

 V ; mas ; G 3-4 — 3-7 ; flesh-r, dark bn on exposure. 



vit ; trp, strl : Bl, fus bkh glass ; bor violet. Prim 

 Cleav mas, gran ; G 2-4 — 2-5 ; w, bh, rh, gnh ; vit, 



p'ly ; trl ; phosphoresces . Bl, fus ; bor trp glass. 



Prim. 

 II ; mas ; G 3-3 — 3-4 ; bn, gn, w ; vit, res, cryst often 



brilliant ; trp, strl : Bl, fus ! trl glob. Prim ; vole ; 



gran limest. 

 Ill ; bot, mas ; G 28—3 ; light gn, w ; vit, p'ly ; trl, 



strl ; tough ; mur sol, exe't silica : Bl, fuB. Amyg, 



prim. 

 IV ; mas, gran, col ; G 3-2— 3-5 ; ywh-gn, gy, bn, bh, 



rh ; vit, p'ly ; trp, op : Bl, fus. Prim, etc. 

 Cleav mas, gran ; G 3-1 — 3-2 ; gyh-w, gnh ; ply : BU 



fus, intum, exf, colorless glass. Prim. 



V ; cryst acute-edged ; Gr 3-2—3-3 ; deep bn ; vit, 

 brilliant ; trp, strl : Bl, fns ! intum dark gn glass ; 

 Prim, etc. 



I ; cryst, mas, gran ; G 3*5 — 4-3 ; r, bn, w, gn, bk 



often bright ; vit, res ; trp, trl : Bl, fus, no efferv 



bk glob. Prim, etc. 

 I ; hemihed cubes ; G 2-9—3 ; w, gyh ; vit, ad ; strp 



trl ; pyro-electric : Bl, fus, intum. Gypsum. 

 Ill; mas, glassy; G 2-6— 2-8; b, gyh-b, bnh; trp, 



trl : Bl, fus dif ! bor trp, glass. Prim. 

 VI ; col, mas ; G 3 — 3-1 ; bk, bn, gn, r, b, w, ofteB 



bright ; vit, res ; trp, op ; pyro-electric : Bl, fus, 



intum. Prim, etc. 

 IV ; in crystals, cleav ; G 2-9 — 3-1 ; pale-gn, b, w , 



vit, brilliant ; trp, strl : Bl, fus dif ( intum. Prim 

 VI ; hexag pms, mas ; G 2*6—2-8 ; gn, bright oi 



dull,bh, ywh ; trp, strl: Bl, fu.8 dif; bor trp glass 



Prim. 



