Stones.

Specific. Gravity.

Weight of one Cubic

Foot.

Cubic

Feet per

Ton.

Water = 1.

Pounds.

Cubic Ft.

Alabaster, calcareous.............................

2.76

172.1

13.0

" gypseous..................................

2.31

144.0

15.6

Barytes................................

4.45

277.5

8.07

Basalt............................

2.45-3.00

152.8-187.1

14.7-12.0

Chalk, air-dried..............................

2.78

155

14.5

Diamond..........................

3.50

Flint..........................

2.59

164

13.7

Felspar.........................

2.60

162.1

13.8

Gneiss...........................

2.69

168

13.3

Granite.........................

2.50-2.74

156-171

14.4-13.1

Graphite..........................

2.20

137.2

16.3

Jasper......................

2.72

169.7

13.2

Limestone......................

1.86-2.53

116-158

19.3-14.2

Marble:

African......................

2.80

174.6

12.8

British....................

2.71

169.0

13.3

Carrara.....................

2.72

169.6

13.2

Egyptian green.................

2.67

166.5

13.5

Florentine...................

2.52

157.1

14.3

French.......................

2.65

165.2

13.6

Mica.

2.93

183

12.2

Oolitic stones................................

1.89-2.60

118-162

19.0-13.8

Ores:

Spicular or red iron ore......................

5.21

327.4

6.84

Magnetic iron ore.....................

5.09

317.6

7.05

Brown iron ore...........................

3.92

244.6

9.16

Spathic iron ore.......................

3.83

238.8

9.38

Quartz................................

2.61-2.71

162.8-169

13.8-13.3

Sandstone...............................

2.04-2.70

127-168

17.6-13.3

Serpentine...........................

2.81

175.2

12.8

Slate.................................

2.60-2.85

162.1-177.7

13.8-12.6

Talc, steatite....................................

2.70

168,4

13.3