Figure 6.
The Raman signature of carbon in the hydrothermal vein is poorly crystalline, with
a merged G+D2 peak at around 1600 cm-1, and a D1 peak at around 1340 cm-1.
Lindgren et al. Geochemical Transactions 2011 12:3 doi:10.1186/1467-4866-12-3
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