cervantite

{{infobox mineral | name = Cervantite | boxwidth = | boxbgcolor = | image = Cervantite-109568.jpg | imagesize = 260px | alt = | caption = Microscopic cervantite crystals from Slovakia (3 mm field of view) | category = Oxide mineral | formula = Sb3+Sb5+O4 | IMAsymbol=Cvn | molweight = | strunz = 4.DE.30 | dana = | system = Orthorhombic | class = Pyramidal (mm2) (same H-M symbol) | symmetry = Pbn21 | unit cell = a = 5.43 Å, b = 4.81 Å, c = 11.76 Å; Z = 4 | color = Yellow to nearly white | colour = | habit = Microscopic acicular crystals; massive | twinning = | cleavage = Excellent on {001}, distinct on {100} | fracture = Conchoidal | tenacity = | mohs = 4–5 | luster = Greasy, pearly, earthy | streak = Pale yellow to white | diaphaneity = Semitransparent | gravity = 6.5 | density = | polish = | opticalprop = Biaxial | refractive = nα = 2.000 nγ = 2.100 | birefringence = δ = 0.100 | pleochroism = | 2V = | dispersion = relatively weak | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = }} Cervantite, also formerly known as antimony ochre — is an antimony oxide mineral with formula Sb3+Sb5+O4 (antimony tetroxide).

It was first described in 1850 for an occurrence in Cervantes, Galicia, Spain, and named for the locality. The mineral was questioned and disapproved, but re-approved and verified in 1962 based on material from the Zajaca-Stolice district, Brasina, Serbia. It occurs as a secondary alteration product of antimony bearing minerals, mainly stibnite. thumb|upright|left|Cervantite and valentinite replacing stibnite from the Xikuangshan Mine of Hunan Province, China (size: 16.1 × 5.0 × 3.0 cm)