Orthopinacoid


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Or`tho`pin´a`coid


n.1.(Crystallog.) A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.
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The crystals are minute, singly terminated, acicular laths elongated parallel to the c axis and tabular parallel to the orthopinacoid (100).
THE SAPUCAIA PEGMATITE, MINAS GERAIS, BRAZIL
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