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Isoclasite

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Formula:
Ca2(PO4)(OH) · 2H2O
Colour:
colourless, snow-white; colourless in transmitted light.
Lustre:
Vitreous, Pearly
Hardness:
1
Specific Gravity:
2.92
Crystal System:
Monoclinic
Name:
From the Greek for "equal fracture," in allusion to the cleavage.
This page provides mineralogical data about Isoclasite.


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Classification of IsoclasiteHide

Approved, 'Grandfathered' (first described prior to 1959), Questionable
8.DN.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
N : With only large cations
42.6.2.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
19.4.4

19 : Phosphates
4 : Phosphates of Ca

Physical Properties of IsoclasiteHide

Vitreous, Pearly
Transparency:
Transparent
Comment:
Lustre pearly on cleavages.
Colour:
colourless, snow-white; colourless in transmitted light.
Hardness:
Cleavage:
Distinct/Good
On {010}, distinct.
Density:
2.92 g/cm3 (Measured)    

Optical Data of IsoclasiteHide

Type:
Biaxial (+)
RI values:
nα = 1.565 nβ = 1.568 nγ = 1.580
2V:
Calculated: 54°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v strong

Chemical Properties of IsoclasiteHide

Formula:
Ca2(PO4)(OH) · 2H2O

Crystallography of IsoclasiteHide

Crystal System:
Monoclinic
Morphology:
Crystals minute, dull, prismatic [001]; also occurs as cotton-like fibers.

Type Occurrence of IsoclasiteHide

General Appearance of Type Material:
Transparent crystals, to 4 cm in length, partly altered to a milky colored material.
Geological Setting of Type Material:
Reddish dolomite vein in hornfels.
Associated Minerals at Type Locality:

Other Language Names for IsoclasiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.DN.05NatrophosphateNa7(PO4)2F · 19H2OIso. m3m (4/m 3 2/m) : Fd3c
8.DN.15LermontoviteU(PO4)(OH) · H2OOrth. mmm (2/m 2/m 2/m) : Ccca
8.DN.15UrphoiteU4+6(PO4)7(OH)3 · 4H2OMon.
8.DN.20VyacheslaviteU(PO4)(OH) · nH2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.4.1MonetiteCa(HPO4)Tric. 1
19.4.2HydroxylapatiteCa5(PO4)3(OH)Hex. 6/m : P63/m
19.4.3BrushiteCa(HPO4) · 2H2OMon. m : Bb
19.4.5BuchwalditeNaCa(PO4)Orth. mm2 : Pmn21
19.4.6CanaphiteNa2Ca(P2O7) · 4H2OMon.
19.4.7Mundrabillaite(NH4)2Ca(HPO4)2 · H2OMon. m : Pm
19.4.8WhitlockiteCa9Mg(PO4)6(HPO4)Trig. 3m : R3c
19.4.9BrianiteNa2CaMg(PO4)2Mon. 2/m : P21/b
19.4.10Petersite-(Y)(Y,Ce,Nd)Cu6(PO4)3(OH)6 · 3H2OHex.

Other InformationHide

Notes:
Readily soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for IsoclasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sandberger, F., (1870): "Ueber Isoklas und Kollophan, zwei neue Phosphate": J. prakt Chemie, Neue Folge, 2,125-130 (as Isoklas).
Sandberger, F., (1870): Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 306 (as Isoklas).
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 835.
Larsen, E. S. (1921): "The microscopic determination of the nonopaque minerals": US Geol. Surv. Bull. 679: 92.
Journal of the Czech Geological Survey (1997): 42(4): 24-25, 118-119.

Internet Links for IsoclasiteHide

Localities for IsoclasiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
Steve Sorrell Collection
    • Flying Fish Cove
Steve Sorrell Collection
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
Sandberger, F., (1870), J. prakt. Chemie, Neue Folge, 2, 125-130; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 933.
Portugal
 
  • Aveiro District
    • Albergaria-a-Velha
      • Branca
Mineral and/or Locality  
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