Formula: CaY(CO3)2(OH).H2O
Hydrated carbonate containing hydroxyl, yttrium-bearing mineral
Crystal System: Tetragonal
Specific gravity: 3.19
Hardness: 2 to 3
Streak: White
Colour: White to colourless
Solubility: Effervesces in 1:10 acids (Dana)

Metamorphic environments
Hydrothermal environments

Kamphaugite-(Y) is a late-stage secondary mineral formed as a result of low-temperature hydrothermal alteration of yttrium-bearing minerals in granitic rocks, often found in cavities and cracks (Mindat, Dana).


At the Paratoo copper mine, Yunta, Olary Province, South Australia, kamphaugite-(Y) is associated with decrespignyite-(Y), caysichite-(Y) and donnayite-(Y) in narrow fissures of a fine-grained dolomitic slatestone (Minrec 35.2.177, HOM).

At the Cala Francese Quarries, La Maddalena Island, La Maddalena, Sassari Province, Sardinia, Italy, kamphaugite-(Y) is associated with with kainosite-(Y) and hingganite-(Y) (HOM ).

At the Verkhnee Espe Massif, Akzhaylyautas Mountains, Tarbagatai Range, East Kazakhstan, kamphaugite-(Y) occurs in metasomatically altered alkali granite (AM 79.387-388, HOM).

At the type locality, Hørtekollen, Sylling, Lier, Buskerud, Norway, kamphaugite-(Y) occurs as platy crystals to 1 mm across, sometimes with a coating of montmorillonite, in cavities of a magnetite-helvine contact metamorphic skarn deposit. Associated minerals include wollastonite, tourmaline, sphalerite, scorodite, rhodonite, quartz, pyroxenes, montmorillonite, molybdenite, heulandite-(Ca), hemimorphite, helvine, grossular, galena, fluorite, epidote, chabazite, calcite, biotite, apatite, amphiboles, K-feldspar and allanite group minerals (AM 79.387-388, Mindat).

At Høydalen, Tørdal, Drangedal, Vestfold og Telemark, Norway, kamphaugite-(Y) occurs as a fine-grained alteration product of kuliokite-(Y) (AM 79.387-388).

At the Tangen Feldspar Mine, Kragerø, Vestfold og Telemark, Norway, kamphaugite-(Y) occurs as well-crystallised rosettes along cracks in feldspar and quartz in the granite pegmatite (AM 79.387-388, Dana).

At the Goudini carbonatite complex, Ngaka Modiri Molema District Municipality, North West, South Africa, kamphaugite-(Y) occurs as white spheroids on opal from a quartz and baryte vein in a carbonatised volcano (AM 79.387-388, HOM).

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