Mangerton mountain abounds in variety of minerals; whetstones; argillaceous iron ore; red and brown iron stones; spicular iron ore, adhering to quartz; and numerous siliceous stones, but no calcareous specimens.
Transparent crystals, generally known under the name of Kerry stones, are found in various parts. Many of these resemble the diamond in its property of cutting glass, but soon lose their hardness. The mineralogist must principally direct his search for them amongst the rocks and cliffs on the sea coast. Coloured crystals are found in the vicinity of the lakes: these often resemble emeralds, topazes, and sapphires. Some real amethysts have also been discovered.
Near Castle Island is found the once famous _Lapis hibernicus_, or Irish slate, formerly of some officinal reputation, abounding in common green copperas, or martial vitriol; also at Tralee.
At Dune, near Tralee, are pyrites, with sulphur, and iron ore.
Extensive iron works formerly existed at Glencarne, especially near Blackstairs.
A salino-nitrous spring at Magherybeg rises out of the sand; antiscorbutic.
_Andromeda polifolia_, Marsh Cistus or Wild Rosemary: in bogs in Iveragh and Dunkerron baronies, and near Isaac-town.
_Arbutus Unedo_, Strawberry-tree:--on rocks and mountains about Lough Lane.
_Artemisia campestris_, Field Southern-wood:--in a field near Castle Island.
_Asplenium Adiantum nigrum_, Common Black Maiden-hair:--on the mountains.
_Asplenium Ceterach_, Spleenwort or Milkwort:--on rocks.
_Asplenium Ruta muraria_, White Maiden-hair, Wall Rue or Tentwort:--in a rocky cavern near Blackstones.
_Asplenium Trichomanes_, English Black Maiden-hair:--on the rocks in various parts.
_Astragalus arenarius_, Purple Mountain Milkwort; on the mountains about the Lake of Killarney.
_Atriplex portulacoides_, Sea Purslane:--near the river Mang near Callinafersy.
_Atriplex serrata_, Indented Sea Orache:--on the banks of the river Galey, plentifully.
_Cardamine bellidifolia_, Daisy-leaved Ladies' Smock:--in the islands of Lough Lane.
_Cheiranthus sinuatus_, Sea Stock:--near Beal Castle towards the Shannon mouth.
_Chenopodium maritimum_, Sea Blite or White Glasswort:--on the shore near Callinafersy, the bottom of Castlemain harbour.