Figure F1. VNIS spectra from basalts. A. Fresh basalts exhibit a pyroxene peak and trough. B. Crack fill is mostly smectite, with strong water and OH– absorptions, and weak basalt pyroxene; altered whole rock has a signature intermediate between smectite and fresh-rock pyroxene. C. Celadonite is distinguished from smectite by peak at 560 nm and trough/peak at 2400 nm. D. Examples of these features at Site 1256.

Figure F1. VNIS spectra from basalts. A. Fresh basalts exhibit a pyroxene peak and trough. B. Crack fill is mostly smectite, with strong water and OH^– absorptions, and weak basalt pyroxene; altered whole rock has a signature intermediate between smectite and fresh-rock pyroxene. C. Celadonite is distinguished from smectite by peak at 560 nm and trough/peak at 2400 nm. D. Examples of these features at Site 1256.