Civil Engineering - Building Materials - Discussion

42. 

Minimum of 40% of iron, is available in

[A]. Magnetite
[B]. Red haemetite
[C]. Limonite
[D]. Siderite
[E]. Black band.

Answer: Option E

Explanation:

No answer description available for this question.

Nitin said: (Nov 19, 2015)  
Black band means?

Gowda said: (Jan 2, 2016)  
Black band means Chromite.

Jayesh said: (Jan 29, 2016)  
Answer is siderite.

(1) Haematite Red oxide of iron (Fe2O3) 65 to 70% of iron.

(2) Limonite 2Fe2O3, 3H2O (60% of iron).

(3) Magnetite Fe3O4 (70 to 73% of iron).

(4) Pyrite FeS2 (45 to 47% of iron).

(5) Siderite FeCO3 (40% of iron).

Amit Ami Sharma said: (Aug 28, 2016)  
It's;

Pure magnetite 72.4%.

Hamatile 69.9%.

Limonite 59.8%.

Siderite 48.2%.

Pyrite 46.6%.

And minimum 40% black band is the correct answer.

Baloch said: (Oct 27, 2016)  
Yes, agree @Amit.

Sundar said: (Mar 11, 2017)  
Why black band? Please explain clearly.

Chandru said: (Jan 13, 2018)  
Black band is thin siderite which contains 40% of iron.

Ujjwal Mondal said: (Apr 3, 2020)  
It's a siderite. Black band iron percentage is up to 40% not minimum 40%.

Ruchitha said: (Oct 14, 2020)  
Which is the correct answer siderite or black band? Please explain.

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