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Gold Prospecting
Alluvial Gold Prospecting
What are these rocks ?
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<blockquote data-quote="Mungoman" data-source="post: 552244" data-attributes="member: 2730"><p>I reckon that they were originally organic matter - like a seed or something, and it landed on the bed of a shallow sea, or lake, and over time it got covered by silt - it then rotted away and the cavity left in the silt/clay was filled with mineralised water which dried out over time, leaving the mineral, which in this case was silica.</p><p></p><p>So I reckon that it's silica, and the action of it's creation is called a secondary intrusion.</p></blockquote><p></p>
[QUOTE="Mungoman, post: 552244, member: 2730"] I reckon that they were originally organic matter - like a seed or something, and it landed on the bed of a shallow sea, or lake, and over time it got covered by silt - it then rotted away and the cavity left in the silt/clay was filled with mineralised water which dried out over time, leaving the mineral, which in this case was silica. So I reckon that it's silica, and the action of it's creation is called a secondary intrusion. [/QUOTE]
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Gold Prospecting
Alluvial Gold Prospecting
What are these rocks ?
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