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Identity Helpfossil? extruded from lava rock? wood? jade? amazonite

7th Oct 2016 01:34 UTCAngie martin

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fossil? from crystal lake area and the brown amd qiartz? from conifer. not sure exactly where, they were given to me by a friend the fossil is blat on the back with no markings. the brown layers almost look like wax under light and the blue green on the crystal take on a greenr color in the light

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02659280015662288619687.jpg

7th Oct 2016 02:08 UTCBob Harman

ANGIE, I suppose your first example might be a water worn pebble or cobble of basalt, but I am not sure.

The second 2 photos show ? petrified wood on the left side and quartz with a vein of ? malachite on the right side. CHEERS.....BOB

7th Oct 2016 11:35 UTCPeter Nancarrow 🌟 Expert

As Bob says, the specimen in your first photo certainly isn't a fossil, but a pebble of an igneous rock, although its groundmass colour suggests a higher feldspar &/or quartz content (i.e. higher silica content) than a basalt, so it's probably an intermediate igneous rock such as a diorite.


The piece is essentially a water-worn pebble of a homogenous rock mass without any joints or cleavage, yet it has 5 approximately evenly spaced sharp-edged indentations into it from different directions, giving it an apparent "animal shape" which is, I guess, what suggested to you that it might be a fossil?


However, it does not look like a natural shape to me, and my first impression was that someone has started to carve it into some sort of animal sculpture (a bear or turtle perhaps?), but maybe gave up because it was too tough!


Pete N.


ed. for spelling

7th Oct 2016 15:11 UTCEd Clopton 🌟 Expert

The first piece looks like a crude carving as Peter suggests.


The left-hand piece in the second photo might be a piece of massive quartz with roughly parallel fractures. Quartz does not cleave easily, but under the right kind of strain it can develop a system of fractures that looks like this. Of course it could be lots of other things, too . . . it's hard to tell from a couple of photos.


And which Crystal Lake area are they from? There are lots of Crystal Lakes around the English-speaking world.
 
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