1903.] KOENIG—ARTIFICIAL PRODUCTION OF CRYSTALS. 2385 
the habitus of domeykite. These crystals are all fused together 
laterally ; the faces are rough like the leaves of reeds. They are 
not measurable. 
3. On these faces rise curious pyramidal forms as shown in Fig. 6. 
The crystals are slender and small. Their faces are bent and very 
uneven from the alternation of pyramid and prism. The acute 
pyramid predominates, but apex is closed by the normal pyramid 
(see Dr. Wright). Some of the forms, as at a.a., resemble minute 
cup corals; others, as at 4.¢., imitate a club, whilst ¢.c. may be 
likened to a church steeple. 
ad. t1and 2. Crust and crystals cannot be separated. 
Analysis gives (0.0532 gram): 
Cu =='67.74 :) 63 — 1.0752 
Sb = 1.00%: 122 == 0,0082 
(Difference) As = 31.26: 75 — 0.4168 
100.00 
Hence ratio: 
Cu: (AsSb) = 2.52: 1 == 5:2 
Corresponding to a molecular mixture : 
Ss fs fe 
ad. 3. The crystals are so small that the whole of them would 
not make o.1 gram. The sacrifice of any of them came hard. 
3-97 milligrams weighed on a button balance, which is accurate to 
