childrenite

{{Infobox mineral | name = Childrenite | boxwidth = | boxbgcolor = | image = Childrenite.jpg | imagesize = 260px | alt = | caption = | category = Phosphate minerals | formula = | IMAsymbol=Chd | molweight = | strunz = 8.DD.20 | system = Orthorhombic | class = Pyramidal (mm2) (same H-M symbol) | symmetry = Bba2 | unit cell = a = 10.41 Å, b = 13.42 Å, c = 6.92 Å; Z = 8 | color = Yellowish brown, brown, clove-brown; colorless in transmitted light. | colour = | habit = | twinning = | cleavage = Poor/indistinct on {100} | fracture = Irregular/uneven, sub-conchoidal | tenacity = | mohs = 5 | luster = Vitreous, resinous | streak = White | diaphaneity = Transparent, translucent | gravity = 3.11–3.19 | density = | polish = | opticalprop = Biaxial (−) | refractive = nα = 1.644 – 1.649 nβ = 1.662 – 16.830 nγ = 1.671 – 1.691 | birefringence = δ = 0.027 – 0.042 | pleochroism = Visible | 2V = Measured: 40° to 45°, calculated: 50° | dispersion = r > v strong | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = Soluble in acids. | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

Childrenite is a rare hydrated phosphate mineral with elements iron, manganese, aluminium, phosphorus, oxygen and hydrogen. Its chemical formula is and it has a molecular weight of 229.83 g/mol. Its specific gravity is 3.2 and it has a Mohs hardness of 4.5 to 5. It is usually translucent and non-fluorescent, with imperfect cleavage. It has a vitreous lustre with a white streak, and is brown or yellow in color. It has a conchoidal, uneven fracture, and an orthorhombic crystal system.