664 MINERALOGY 



Pinakiolite, 3 MgB 2 O 4 .Mn // Mn /// 2 4 ; Black ; Cl. pin- 



acoidal ; H. 6 ; G. 3.88 ; F. 5 ; IV. 

 2. Yields water. 



a. In the borax bead shows manganese. 



Sussexite, H(Mn.Mg.Zn)B0 3 ; Gray; Silky; H. 3; 



G. 3.12; F. 2.5; IV?; Fibrous. 

 6. The concentrated HC1 solution yields a precipitate with 



H 2 SO 4 (calcium) ; 6, p. 566. 

 COLEMANITE, Ca 2 B 6 O n .5 H,O ; White ; Cl. pina- 



coidal; H. 4-4.5 ; G. 2.42 ; F. 1.5; V; p. 524. 

 Hydroboracite, CaMgB 6 O n .6 H 2 O ; White ; H. 2 ; 



G. 1.95; F. 1.5; Fibrous, foliated. 

 Bechilite, CaB 4 O 7 .4 H 2 O ; Massive. 

 c. Yields magnesium reaction a, p. 567. 



Szaibelyite, Mg 5 B 4 O n .l| H 2 O ; White to yellow; H. 



3-4; G. 3.0; Nodular, acicular. 

 Pinnoite, MgB 2 4 .3 H 2 O ; Sulphur to straw-yellow; 



H. 3-4 ; G. 3.3 ; F. 3 ; II. 

 Heintzite, KMg 2 BnO 19 .7 H 2 O ; White ; Cl. pinacoidal ; 



H. 4-5; G. 2.13; F. 1 ; V. 



B. The finely powdered mineral gelatinizes with HCL 



DATOLITE, Ca(B.OH)Si0 4 ; White, pale green, yellow ; 



H. 5-5.5; G. 2.95; F. 2.5; V; p. 463. 

 Bakerite, 8 CaO, 2 B 2 O 3 , 6 SiO 2 .6 H 2 ; White to pale 



green; Dull; H. 4.5 ; G. 2.13; F.I; Massive. 



C. Insoluble in HCl or only slightly soluble. 



1. Yields water. 



Howlite, H5Ca2B 5 SiO 14 ; White; H. 3.5; G. 2.59; 



F. Difficult ; Nodular, fibrous. 



Hambergite, Be(Be.OH)B0 3 ; Grayish white ; Cl. pin- 

 acoidal ; H. 7.5; G. 2.35; Inf; IV. 



2. Yields little or no water. 



AXINITE, H 2 (Ca.Fe.Mn) 4 (BO)Al 3 (SiO 4 ) 5 ; Clove- 

 brown, green, yellow, gray ; Cl. pinacoidal ; H. 6.5-7 ; 



G. 3.29 ; F. 2.5-3 ; VI ; p. 469. 

 TOURMALINE, complex borosilicate ; Various colors ; 



H. 7-7.5; G. 3.14; F. 3-5; III; p. 473. 

 Danburite, CaB 2 (SiO 4 ) 2 ; White to pale yellow ; H. 7 ; 



G. 3.00 ; F. 3.5-4 ; Nodular, fibrous. 

 Homilite, (Ca.Fe) 3 (BO) 2 (Si0 4 ) 2 ; Brownish black to 



black ; Resinous ; H. 5 ; G. 3.38 ; F. 2 ; V. 



