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Granular 5-15nm diam (matrix) Spherulites l-2cm diam Blocky <300um diain (pumice) Mix 30% Cr + 70% KAF Cr, KAF Mix 15-50% Cr + 05-50% KAF, NaAF Cr, KAF Mix 30% Cr + 70S KAF Mix 40% Cr + 60% KAF Cr, KAF Mix 40% Cr, Q + 60S KAF to 20% Cr, q + 80% KAF Mix 50% Cr.Q + 50% KAF Mix 10% Cr.Q + 90% KAF Cr(Q), KAF Mix 30% Q + 70% KAr Q(Cr), KAF Lithic rich En echelon fractures parallel to fabric are filled with quartz En echelon fractures parallel to fabric are filled with quartz En echelon fractures parallel to fabric are filled with quartz Mix 40% Q, Cr + t >0% KAF Fractures are filled with quartz Q(Cr), KAF Mix 40% Q, Cr + 00% KAF Lithic rich (with Mix 20% q, Cr + 80% KAF cherts) q(Cr), KAF Fractures are filled with quartz

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T h i s report summarizes the work performed d u r i n g 1980 by the Los Alamos National Laboratory and i t s subcontractors on hot dry rock (H D R) geothermal resource evaluation, s i t e characterization, and geophysical exploration techniques. The work was done by region (Far West, Pacific Northwest, Southwest, Rocky Mountain States, Midcontinent, and Eastern) and limited t o the conterminous U.S. I. Biaodal basalt-rhyolite suite; age 0.8-0.01 Wr.