ICELAND-SPAR
\ˈa͡ɪsləndspˈɑː], \ˈaɪsləndspˈɑː], \ˈaɪ_s_l_ə_n_d_s_p_ˈɑː]\
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(Geol.) Finest, most transparent variety of calc-spar; found in large crystalline masses in I. trap-rock.
By Henry Percy Smith
