kainosite-(Y)

{{Infobox mineral | name = Kainosite | boxwidth = | boxbgcolor = | image = Kainosite-(Y)-tuc1051a.jpg | imagesize = 260px | alt = | caption = | category = Silicate mineral | formula = Ca2(Y,Ce) SiO4O12(CO3)•(H2O) | IMAsymbol = Kno-Y | molweight = 664.14 g/mol | strunz = | dana = | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pmnb | unit cell = | color = | colour = Variable, from brown and yellow to colourless | habit = | twinning = | cleavage = {110} Good | fracture = Brittle and uneven | tenacity = | mohs = 5–6 | lustre = vitreous to resinous | streak = White | diaphaneity = Transparent to translucent | gravity = | density = | polish = | opticalprop = Biaxial (-) | refractive = nα = 1.662–1.665 nβ = 1.682–1.689 nγ = 1.687–1.692 | birefringence = Maximum Birefringence: δ = 0.025–0.027 | pleochroism = | 2V = Measured: 40°, Calculated: 38° to 52° | dispersion = strong | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = high relief | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} Kainosite is a silicate mineral that has the formula of Ca2(Y,Ce) SiO4O12(CO3)•(H2O). Kainosite was first discovered in Norway on the island of Hitterø and was named by Adolf Erik Nordenskiöld (1832–1901) in allusion to the Greek word for "unusual" for its rarity and exotic composition.

Kainosite, is part of the orthorhombic crystal class minerals, which is a system that results from stretching a cubic lattice along two of its orthogonal pairs. Kainosite is a biaxial mineral, so the light entering its crystals will be polarized in two vibration directions (XYZ) for it has two optic axes. Because Kainosite is orthorhombic, the vibration directions XYZ coincide with the a,b,c crystallography axes.