Naked Science Forum
Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: Mr-Indy on 01/05/2008 08:36:26
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I've been reading posts on this forum for a few days now..and thought would receive something positive..well its my first post here..and please understand that I'm no geologist nor have any knowledge to identify minerals or metals..just aware of general terms by reading through this forum..
well I'm from india and came across this place while I was on a camp. Below is the picture of that area showing green rocks...and they are soft and can be scracthed by nails too and forms green powder...below these green rocks are white crystals approx 5-6 feet layered...along the path of the hill the rocks become darker and a bit more bluish green. I got the green rock sample tested with a friends help in bombay and below is the lab report of the elements identified in %
Quantitative Analysis test of the Green sample
aluminium : 4.33 %
Silicon : 31.32 %
potassium : 12.60 %
calcium : 3.45 %
Titanium : 2.97 %
Vanadium : 0.06 %
Iron : 44.80 %
Copper : 0.06 %
Rubidium : 0.41 %
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Below are the pics from that area and other white rocks samples...
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well I just wanted to know if I'm nearby any gold ? do these elements suggest anything ?
Here are some more pics of the area
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I have seen altered pegmatites like this in the Llano cratonic area of the US. This could be the zeolite Pollucite which I have sen in West Texas - it is a solid gray-green though.
You may not be near any gold but you may have ore quality rocks for titanium or rubidium - I think 0.4 % or greater is ore quality for rubidium but I will let our mining geologist answer the question in greater detail.
Have you had the white stuff analyzed? Both pure rubidium and titanium when pure are white. But these could also be evaporite minerals from a completely different source.
Where - general location, not specifics - in India is this?
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Welcome to the forum.
Considering the hardness, and the photo, my first guess would be talc- but the chemistry doesn't fit. Talc is high in Mg.
Chlorite or serpentine would be a better fit for the chemistry, color, hardness and appearance of the green rock. Serpentines are altered ultramafic rocks, which would account for the titanium and high iron content. Chlorite is a soft, green mineral (iron aluminum silicate hydroxide) that forms in low temperature-pressure metamorphic conditions and is common as an alteration mineral around mineral deposits and metasomatic (skarn) deposits.
Chlorite is my number one suspect, which may or may not suggest there are mineral deposits in the vicinity. I would want to see a host of other indicator minerals before getting too excited. The color of the iron oxides in your photo of the outcrop is striking- many leach caps above ore deposits have distinctive reddish brown colors.
More interesting to me is the white mineral. Can you give a better description of it? What do the crystals look like? How hard is it? I suspect some sort of carbonate- but would like to get more info.
As JimBob mentioned, both the Titanium and Rubidium grades are high enough to form ore. However, one must be very careful about extrapolating the analysis of one small sample into an ore deposit. Bulk samples (50+ lbs.) would be needed over wide area to even begin talking about a possible deposit. How were the samples prepared and which quantitative analyses were used? Some of the methods are not highly reliable.
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I found a few stones/minerals in my garden and would like to know if anyone could help with identification. Below photos taken from different angles of a particular glass type object. Click the thumbnails to view larger versions i think this is similar to Mr-Indy.
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Thanks in advance.
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Heres another object i'm not sure if its a mineral, stone or glass.
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fimg12.imagehosting.gr%2Fout.php%2Ft211012_b3.jpg&hash=7d8223e299e8b8756c1957603e2a65f9) (http://www.imagehosting.gr/show.php/211012_b3.jpg)(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fimg12.imagehosting.gr%2Fout.php%2Ft211011_b2.jpg&hash=886ebc6ead9f15909eb08c9ec68eba53) (http://www.imagehosting.gr/show.php/211011_b2.jpg)(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fimg12.imagehosting.gr%2Fout.php%2Ft211010_b1.jpg&hash=ea918413ed6555aea0e34e97821c01d5) (http://www.imagehosting.gr/show.php/211010_b1.jpg)
Thanks in advance.
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This is glass type when held to the light the edge is transparent with a dark green glow.
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This at first glance reminded me of tar used in tarmac for roads.
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Thats all of the stones, minerals etc found in my garden i'd appreciate any information that may help me identifying them.
Thanks in advance.
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We used to see stuff very like this when I lived in Shropshire (UK). We thought it was either some sort of volcanic glass or slag from a smelting process.
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This at first glance reminded me of tar used in tarmac for roads.
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http://en.wikipedia.org/wiki/Obsidian
Snap ?
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I would agree with RD that the black rock looks like obsidian- many of your other photos look like glass (whether natural or man made). Can you provide descriptions of the rocks- how hard are they? where do you live? can you see any crystals in the rocks? Do any of them break along fractures, or do they break like glass (no preferential planes of breakage)? Are there any glass works or smelters about?
Chert/jasper may be a possibility- looks like soft sediment deformation in several specimens.
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Sets 1,2,3,4,6,7,9,10,11,12,13 and 15 feel like glass as they make glass sound when tapped on a ceramic/glass surface. Sets 5,8 and 14 feel and sound like rock material. I live in England in the West Midlands, thanks RD for the Obsidian information hope this helps identify the others.
You might be correct blakestyger the material does resemble something spewed out of a furnace. As for the hardness its difficult to explain they were unearthed in the garden however the soil has way too many stones, pebbles and similar as above.