All I know about this  sample is that it came from Costa Rica. This came from a teacher at my old school. A student gave it to her. The only information was that "it came from a beach." This won the prize for being my blackest sample. The reflectance spectrum graph really shows that!

ZERO MAGNIFICATION IMAGE REFLECTANCE SPECTRUM     1X MAGNIFICATION (RED LINE  = 1MM) 3X MAGNIFICATION (RED LINE  = 1MM)

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