• Webster's Revised Unabridged Dictionary
    • n Dipyre (Min) A mineral of the scapolite group; -- so called from the double effect of fire upon it, in fusing it, and rendering it phosphorescent.
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Century Dictionary and Cyclopedia
    • n dipyre A mineral occurring in square prisms, either single or adbering to one another in fascicular groups. Before the blowpipe it melts with ebullition or intumescence, and its powder on hot coals phosphoresces with a feeble light. Its name indicates the double effect of fire upon it in producing first phosphorescence and then fusion. It consists chiefly of silicate of alumina, with small proportions of the silicates of soda and lime, and belongs to the scapolite family.
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Webster's Revised Unabridged Dictionary
Gr. di- = di`s- twice fire