Any ideas on this rock...Aquamarine maybe??

[makton]

I was metal detecting the beach on Lake Superior in the Upper Peninsula, Mi this weekend when I spotted something shining in the morning sun. At first glance I thought it was a broken bottle but this is a very remote area on private property and you just don't find any trash here at all.
I have walked this beach collecting rocks for 3 years and have never seen anything like this before.
Any ideas

It's 1.5" by 1" and 1/2" thick and it is translucent. My little girls have named it the Jewel of the Nile

Makton

 

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[MSgtUSAF]

Looks like sea glass to me

MSgt

 

[makton]

MSgt,
Thanks for your response. It certainly could be Beach Glass based on those pics. Is there a hardness test I can do to get further clarification? The rock/glass/gem is as heavy as a regular rock...would Beach glass be lighter than a similar size rock?

Makton

 

[Michael in SC]

Beach/sea glass gets my vote as well.


Michael

 

[jimbob450]

I too agree with sea glass. Jimbob

 

[makton]

More than likely is beach glass but would beach glass scratch a pocket knife or a razor blade?

Thanks,
Makton

 

[Cappy Z.]

More than likely is beach glass but would beach glass scratch a pocket knife or a razor blade?

Thanks,
Makton

The harder substance does the scratching.. must say it has a gem like quality for glass...a keeper.

[edit] Intermediate hardness
The table below incorporates additional substances that may fall between levels :

Hardness Substance or Mineral
0.2-0.3 Cs, Rb
0.5-0.6 Li, Na, K
1 Talc, graphite
1.5 Ga, Sr, In, Sn, Ba, Tl, Pb
2 hexagonal BN [10], Ca, Se, Cd, sulfur, Te, Bi
2.5 to 3 Mg, Au, Ag, Al, Zn, La, Ce
3 Calcite, Cu, As, Sb, Th
4 Fluorite, Fe, Ni
4 to 4.5 Pt, Steel
5 Apatite, Co, Zr, Pd
5.5 Be, Mo, Hf
6 Orthoclase, Ti, Mn, Ge, Nb, Rh, uranium
6 to 7 Glass, fused quartz, Iron pyrite, Si, Ru, Ir, Ta
7 Quartz, vanadium, Os, Re
7.5 to 8 Hardened steel, Tungsten, emerald
8 Topaz
8.5 Chrysoberyl, Cr
9 Corundum, Carborundum (SiC), Tungsten carbide
<10 Rhenium diboride, Tantalum carbide, Boron [11][12]
10 Diamond
>10 Nanocrystalline diamond