Childrenite Mineral Data

General Childrenite Information

Chemical Formula:

Fe++Al(PO4)(OH)2•(H2O)

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

Empirical Formula:

Fe²⁺Al(PO₄)(OH)₂•(H₂O)

Environment:

Forma a series with eosphorite.

IMA Status:

Valid Species (Pre-IMA) 1823

Locality:

Tavistock, Devonshire, England. Link to MinDat.org Location Data.

Name Origin:

Named for John George Children (1777-1852), English chemist and mineralogist.

Name Pronunciation:

Childrenite + Pronunciation

Synonym:

ICSD 30686

PDF 47-1859

Childrenite Image

Images:

Childrenite

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

Images:

Childrenite

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

Images:

Childrenite

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

Axial Ratios:

a:b:c =0.776:1:0.5164

Cell Dimensions:

a = 10.395, b = 13.394, c = 6.918, Z = 8; V = 963.20 Den(Calc)= 3.17

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Bba2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.81(1), 2.42(0.4), 5.27(0.4),

Forms:

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

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Physical Properties of Childrenite

Cleavage:

{???} Imperfect

Color:

White, Yellowish brown, Brownish black.

Density:

3.18 - 3.25, Average = 3.21

Diaphaneity:

Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Childrenite

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

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.

Pleochroism (x):

yellow or yellow.

Pleochroism (y):

pink or pink.

Pleochroism (z):

pale pink or colorless.

Calculated Properties of Childrenite

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Childrenite =3.17 gm/cc.

Fermion Index:

Fermion Index = 0.0053879819
Boson Index = 0.9946120181

Photoelectric:

PE_Childrenite= 8.15 barns/electron
U=PE_Childrenite x rElectron Density= 25.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Childrenite is Not Radioactive

Childrenite Classification

Dana Class:

42.07.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq � x(H2O)

(42.07.01)Childrenite Group

42.07.01.01 Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2

42.07.01.02 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m

42.07.01.03 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

42.07.01.04 Sinkankasite H2MnAl(PO4)2(OH)•6(H2O) P1 1

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Childrenite Specimen Label here :

Childrenite

Fe++Al(PO4)(OH)2•(H2O)
Dana No: 42.07.01.01 Strunz No: 08.DD.20
Locality:

Notes:

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