Pyroxene data

 

 

Combinations on crystals of pyroxene
  Forms Varieties Illustrations Locality
1 b, c, m, u, s (pseudomorph) Diopside   Sterling Hill
2 a, b, c, m, p, s, o Schefferite Figure 75 Sterling Hill
3 a, b, c, m, p, z, u, s Schefferite Figure 76 Sterling Hill
4 a, b, c, m, p, u, s Schefferite   Sterling Hill
5 a, b, m, s Jeffersonite Figure 77 Sterling Hill
6 a, b, m, p, s; twin Jeffersonite Figure 78 Sterling Hill
7 a, b, m, p, z, s, o Jeffersonite Figure 79 Sterling Hill
8 a, b, c, m Leucaugite Figure 82 Sterling Hill
9 a, b, c, m, p, s, o; twin Leucaugite Figure 83 Sterling Hill
10 a, b, c, m, p, u, s, o Leucaugite   Sterling Hill
11 a, b, c, m, p, e, u, s, o Leucaugite Figure 84 Sterling Hill
12 a, b, m, p, u, s Leucaugite Figure 80 Franklin
13 a, b, c ,m Leucaugite   Balls Hill
14 a, b, c, m, s Leucaugite Figure 81 Balls Hill
15 a, b, m, y, G, R Pyroxene (?) Figure 85 Sterling Hill

 

Analyses of pyroxene
 

1

2

3

4

5

6

7

SiO2

52.06

49.80

51.20

52.86

51.70

45.95

49.03

CaO

26.30

21.07

21.09

24.48

23.68

21.55

19.88

MgO

15.56

12.35

12.70

13.24

12.57

3.61

5.81

MnO

4.57

9.69

9.96

5.31

7.43

10.20

7.91

ZnO

Tracea

Trace

1.65

3.38

3.31

10.15

7.14

FeO  

1.61

0.27

   

8.91

3.95

Al2O3

1.41*

0.26

1.50

1.08†

0.36

0.85

0.86

Fe2O3  

1.46

1.35

 

0.37

 

4.22

H2O +  

1.31

0.59

0.45

0.65

0.35

0.70

H2O -  

1.55

0.32

     

0.60

Na2O  

0.09

         
CO2  

0.43

         
F  

0.32

         

99.90

99.94

100.13

100.80

100.19

101.57

100.10

O = F2

0.13

0.13

   

99.81

100.00

       
[* represents combined Al2O3 + FeO]
[† represents combined Al2O3 + Fe2O3]
aZinc present as willemite.
1. Diopside, Franklin. Jenkins and Bauer (243), analysts.
2. Schefferite, Sterling Hill. W. T. Schaller (195), analyst.
3. Same recomputed to 100 percent after deducting CaCO3 equivalent to CO2.
4. Zinc schefferite, Franklin. J. E. Wolff (185), analyst.
5. Zinc schefferite, Franklin, specific gravity 3.30. W. F.Hillebrand (183), analyst.
6. Jeffersonite, Franklin, specific gravity 3.63. F. Pisani (107), analyst.
7. Jeffersonite, Franklin, specific gravity 3.55. George Steiger (195), analyst.

 

 
 
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