Out dropped the world’s first heavy metal band
With silica and iron side by side
This rocking BIF precipitate was grand.
But modern industry required more
Than hematite with intermingled chert
The silica component they abhor
Must be expunged by fluids which convert
The BIF into a high grade iron mine
A cooling basal fluid can’t displace
As much quartz gangue as pulsing solo brine
With carbonate fade in- not acid- bass.
When silica got kicked out of the band
The iron oxide satisfied demand.
Other geosonnets: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
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