APART from the galena type of crystal with which a fine wire or cat’s-whisker is used, the oldest known crystals in use for detectors are those of the perikon type; in which two crystals are in contact with each other (generally zincite and copper pyrites, or zincite and bornite).
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290607.2.73
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Radio Record, Volume II, Issue 47, 7 June 1929, Page 31
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49Untitled Radio Record, Volume II, Issue 47, 7 June 1929, Page 31
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