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Childrenite Mineral Data

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General Childrenite Information

Help on Chemical  Formula: Chemical Formula: Fe++Al(PO4)(OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 229.83 gm
   Aluminum    11.74 %  Al   22.18 % Al2O3
   Iron        24.30 %  Fe   31.26 % FeO
   Phosphorus  13.48 %  P    30.88 % P2O5
   Hydrogen     1.75 %  H    15.68 % H2O
   Oxygen      48.73 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Al(PO4)(OH)2•(H2O)
Help on Environment: Environment: Forma a series with eosphorite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1823
Help on Locality: Locality: Tavistock, Devonshire, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John George Children (1777-1852), English chemist and mineralogist.
Help on Name Pronunciation: Name Pronunciation: Childrenite + Pronunciation Say CHILDRENITE
Help on Synonym: Synonym: ICSD 30686
  PDF 47-1859

Childrenite Image

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Comments: Single, terminated crystal of childrenite.
Location: Linopolis, Minas Gerais, Brazil. Scale: 2.6 cm.
© John Veevaert

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Comments: Light-brown, acicular, divergent sprays of childrenite.
Location: Rapid Creek, Yukon, Canada. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

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Comments: Columnar, brown, prismatic, crystalline aggregate of childrenite with dark blue lazulite.
Location: Rapid Creek, Yukon Territory, Canada. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Childrenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.776:1:0.5164
Help on Cell Dimensions: Cell Dimensions: a = 10.395, b = 13.394, c = 6.918, Z = 8; V = 963.20 Den(Calc)= 3.17
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Bba2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.81(1), 2.42(0.4), 5.27(0.4),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 2 1) ( 1 0 0) ( 1 1 0) ( 1 3 1)

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Physical Properties of Childrenite

Help on Cleavage: Cleavage: {???} Imperfect
Help on Color: Color: White, Yellowish brown, Brownish black.
Help on Density: Density: 3.18 - 3.25, Average = 3.21
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Childrenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2097,KC= 0.2145
Ncalc = 1.68 - 1.7
Help on Optical Data: Optical Data: Biaxial (-), a=1.649, b=1.683, g=1.691, bire=0.0420, 2V(Calc)=50, 2V(Meas)=40-45. Dispersion strong, r < v.
Help on Pleochroism (x): Pleochroism (x): yellow or yellow.
Help on Pleochroism (y): Pleochroism (y): pink or pink.
Help on Pleochroism (z): Pleochroism (z): pale pink or colorless.

Calculated Properties of Childrenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Childrenite =3.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0053879819
Boson Index = 0.9946120181
Help on Photoelectric: Photoelectric: PEChildrenite = 8.15 barns/electron
U=PEChildrenite x rElectron Density= 25.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Childrenite is Not Radioactive

Childrenite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.07)where (AB)5 (XO4)3 Zq � x(H2O)
  (42.07.01)Childrenite Group Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono Sinkankasite H2MnAl(PO4)2(OH)•6(H2O) P1 1
Help on  Strunz Class: Strunz Class: 08.DD.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1
08.DD.20 Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2
08.DD.20 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m
08.DD.20 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

Other Childrenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Childrenite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 08.DD.20





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