samarskite-(Y)

{{Infobox mineral | name = Samarskite-(Y) | category = Oxide minerals | boxwidth = | boxbgcolor =#6a6750 | boxtextcolor = #fff | image = Samarskite-(Y)-351417.jpg | imagesize = | caption = | formula = | IMAsymbol = Smk-Y | strunz = 4.DB.25 | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pbcn | unit cell = a = 5.687 Å, b = 4.925 Å c = 5.21 Å; Z = 2 | color = Black, may have a brownish tint, brown to yellowish brown due to alteration; light to dark brown in transmitted light | habit = Crystals elongated with pyramidal terminations; commonly granular to massive | twinning = | cleavage = {010}, indistinct | fracture = Conchoidal fragments | tenacity = Brittle | mohs = 5–6 | luster = Vitreous – resinous | refractive = n = 2.1–2.2 | opticalprop = Appears isotropic | birefringence = | pleochroism = | streak = Reddish brown | gravity = | density = 5.6 – 5.8, Average = 5.69 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Opaque, transparent in thin fragments | other = 25px Radioactive (Greater than 70 Bq / gram) | alteration = Metamict | references = }}

Samarskite is a radioactive rare earth mineral series which includes samarskite-(Y), with the chemical formula and samarskite-(Yb), with the chemical formula . The formula for samarskite-(Y) is also given as .