A Treatise On Metalliferous Minerals And Mining
A Treatise On Metalliferous Minerals And Mining
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Digenite, — Composition : 70*20 copper, 29*56 silver, and 0*24 silver.
Copper Pyritesy or Sulphide of Copper. — ^This is the most abundant ore of copper. Composition ; copper 34-6; sulphur 34*9, and iron 30*5. It is of a brass yellow colour, and re- sembles both specks of gold and iron pyrites. It may be distinguished from the former metal by crumbling when an attempt is made to cut it, and from the latter by its yielding to the point of a knife and its not striking fire, as well as by its deep...er yellow colour streaked by a greenish black. Under the blowpipe it fuses into a steel-grey globule, which is magnetic.
If the ore is of a fine yellow colour and yields readily under the hammer, it is good ore ; but if it is hard and of a pale colour, it is poor, through containing more iron pyrites. Its usual hardness is 3*5 to 4, and its gravity 4-1 to 4*3. Its varieties are : C«^a«.— Composition : 22*96 copper, 42*51 iron, and 34*78 sulphur.
Variegated or Purple Copper^ or Variegated Copper Pyrites.
What to read after A Treatise On Metalliferous Minerals And Mining?
You can find similar books in the "Read Also" column, or choose other free books by David Christopher Davies to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Digenite, — Composition : 70*20 copper, 29*56 silver, and 0*24 silver.
Copper Pyritesy or Sulphide of Copper. — ^This is the most abundant ore of copper. Composition ; copper 34-6; sulphur 34*9, and iron 30*5. It is of a brass yellow colour, and re- sembles both specks of gold and iron pyrites. It may be distinguished from the former metal by crumbling when an attempt is made to cut it, and from the latter by its yielding to the point of a knife and its not striking fire, as well as by its deep...er yellow colour streaked by a greenish black. Under the blowpipe it fuses into a steel-grey globule, which is magnetic.
If the ore is of a fine yellow colour and yields readily under the hammer, it is good ore ; but if it is hard and of a pale colour, it is poor, through containing more iron pyrites. Its usual hardness is 3*5 to 4, and its gravity 4-1 to 4*3. Its varieties are : C«^a«.— Composition : 22*96 copper, 42*51 iron, and 34*78 sulphur.
Variegated or Purple Copper^ or Variegated Copper Pyrites.
What to read after A Treatise On Metalliferous Minerals And Mining?
You can find similar books in the "Read Also" column, or choose other free books by David Christopher Davies to read onlineMoreLess
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