646 MINERALOGY 



5. Shows iodine ; c, p. 589. 



IODYRITE, Agl; Lemon-yellow; Resinous; H. 1.5; 



G. 5.65 ; F. 1 ; III ; p. 330. 

 Miersite, Agl ; G. 5.64 ; F, 1 ; I. 



C. Treated as in III the button is tin. 



CASSITERITE, Sn0 2 ; Brown to black; H. 6-7; 

 G. 6.95 ; Inf. ; II ; p. 347. 



1. Yields a boric acid flame with Turner's flux; p. 592. 



Nordenskiodine, CaSn(B.O 3 ) 2 ; Sulphur-yellow ; Cl. 

 basal ; H. 5.5-6 ; G. 4.20 ; Inf. ; III. 



2. Yields water in the closed tube. 



Stokesite, CaSn(Si0 3 ) 3 .H 2 ; Colorless; H. 6; G. 3.18; 

 IV. 



D. Treated as in III the button is lead, or with von Kobell's flux 



shows lead; 6, p. 580. 



1. The powdered mineral heated with a few fragments of 



coal in the closed tube yields an arsenic mirror ; 6, 



p. 585. 

 a. Becomes magnetic in the R. F. 



Carminite, Pb 3 Feio(AsO 4 )i 2 ; Carmine-red; CL pris- 

 matic; H. 2.5; G. 4.10; IV. 

 Lossenite, (Fe.OH) 9 (As.0 4 )6.PbSO 4 .12 H 2 ; Yellow 



to brownish red ; H. 3-4 ; F. 2.5 ; IV. 

 Beudantite, Fe, Pb, Cu, S0 4 , (P.As)O 4 ?; Olive-green, 



brown to black; Cl. basal; H. 3.5-4.5; G. 4.15; 



F. 3.5; III. 

 6. Yields a chlorine reaction; a, p. 588. 



MIMETITE, Pb 4 (Pb.Cl)(As0 4 ) 3 ; White, yellow, brown ; 



Resinous; H. 3.5 ; G. 7.12; F. 1.5; III; p. 512. 

 Ecdemite, Pb 4 As 2 O 7 .2 PbCl 2 ; Yellow to green ; Greasy ; 



Cl. basal; H. 2.5-3 ; G. 7.00; F. 1.5?; IV. 



2. Shows antimony, p. 584, and titanium; b, p. 570. 



Mauzeliite, (Ca.Pb.Na2) 4 TiSb 4 Oi 6 ; Brown; H. 6-6.5; I. 



3. Fused with soda it yields a sulphur reaction; b, p. 587. 



a. Effervesces with hot nitric acid (carbonates). 

 Leadhillite, Pb 2 (Pb.OH) 2 (C0 3 ) 2 SO 4 ; White; Pearly; 



Cl. basal; H. 2.5; G. 6.45; F. 1.5; V. 



b. Yields a strong sodium flame (yellow). 



Caracolite, Pb(OH)ClNa 2 SO 4 ; White; H. 4.5; Fl. 

 5-2; IV. 



c. Becomes magnetic in R. F. 



