Fig. 7: Image RM-B4a-1.jpg This image was selected because in contained a variety of minerals and unusual texture. It was taken at a magnification of 550x. The letters correspond to chemical microanalyses. A: Albite [NaAlSi3O8] Spectrum from Albite B and D: Phengite [K.75(Al,Mg,Fe)2(Al,Si)4)10(OH)2] Analysis from Phengite Spectrum from Phengite C: Lawsonite [CaAl2Si2O8.H2O] Analysis from Lawsonite Spectrum from Lawsonite E: Sphene [CaTiO(SiO4)] Spectrum from Sphene F: Glaucophane [_Na2(Mg3Al2)Si8O22(OH)2] Analysis from Glaucophane Spectrum from Glaucophane

Fig. 8: Image RM-B4a-2.jpg This image was selected for the variety of minerals pictured as well as displaying a different texture than the first image. It was taken at a magnification of 350x. A: Glaucophane [_Na2(Mg3Al2)Si8O22(OH)2] Analysis for Glaucophane B: Phengite [K.75(Al,Mg,Fe)2(Al,Si)4)10(OH)2] C: Glaucophane [_Na2(Mg3Al2)Si8O22(OH)2] Analysis for Glaucophane Spectrum for Glaucophane D: Phengite [K.75(Al,Mg,Fe)2(Al,Si)4)10(OH)2] (same composition as B) E: Apatite[Ca3P2O8] Analysis for Apatite Spectrum for Apatite F: Albite [NaAlSi3O8] Analysis for Albite

Fig. 9: Image RM-B4a-3.jpg This image was selected for analysis because the minerals had slightly different, more equant forms that the common crystal shapes throughout the specimen. It was taken at a magnification of 800x. A: Glaucophane [_Na2(Mg3Al2)Si8O22(OH)2] Analysis for Glaucophane B: Phengite [K.75(Al,Mg,Fe)2(Al,Si)4)10(OH)2] (same composition as above) C: Sphene [CaTiO(SiO4)] Analysis for Sphene

Other miscellaneous spot analyses performed on RM-B4a, in an effort to cover the entire sample:

• Analysis for a Garnet [(Mg_0.23Mn_0.63Ca_0.78Fe_1.63)Al₂Si₃O₁₂]
  This is the only garnet observed in sample RM-B4a.
• Analysis of a Glaucophane [_Na₂(Mg₃Al₂)Si₈O₂₂(OH)₂]
• Analysis of another Glaucophane [_Na₂(Mg₃Al₂)Si₈O₂₂(OH)<$

Table 1: Compositions of Glaucophane Crystals in RM-B4a

• Glaucophane
• Glaucophane
• Glaucophane
• Lawsonite
• Phengite

Table 2: Compositions of Glaucophane Crystals in SB7

Sample #	Na ions	Mg ions	Al ions	Si ions	Ca ions	Fe ions	Cation sum	Total %
SB7glaucophane1SEM	1.96	2.34	1.27	8.00	0.18	1.58	15.34	100.96
SB7glaucophane2SEM	2.01	1.74	0.76	8.13	0.19	2.65	15.50	100.96
SB7glaucophane3SEM	1.99	1.82	1.74	8.01	0.02	1.50	15.11	97.51
Average	1.99+.03	1.97+.33	1.26+.49	8.05+.07	0.13+.10	1.91+.64	15.32+.20