Mindat Logo
Home Page Log In Messageboard The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Isoclasite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
Ca
 
2
(PO
 
4
)(OH) · 2H
 
2
O
System:MonoclinicColour:colourless, snow-white; ...
Hardness:1
Name:From the Greek for "equal fracture," in allusion to the cleavage.
This page provides mineralogical data about Isoclasite.

Classification of Isoclasite

IMA status:Questionable/Doubtful
Strunz 8th edition ID:7/D.36-30
Nickel-Strunz 10th (pending) edition ID:8.DN.10

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

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

19 : Phosphates
4 : Phosphates of Ca
mindat.org URL:http://www.mindat.org/min-2051.html
Please feel free to link to this page.

Type Occurrence of Isoclasite

Type Locality:Jáchymov (St Joachimsthal), Jáchymov (St Joachimsthal) District, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
General Appearance of Type Material:Transparent crystals, to 4 cm in length, partly altered to a milky colored material.
Year of Discovery:1870
Geological Setting of type material:Reddish dolomite vein in hornfels.
Associated Minerals at type locality:
DolomiteChalcedony

Physical Properties of Isoclasite

Lustre:Vitreous, Pearly
Diaphaneity (Transparency):Transparent
Comment:Lustre pearly on cleavages.
Colour:colourless, snow-white; colourless in transmitted light.
Hardness (Mohs):1
Cleavage:Distinct/Good
On {010}, distinct.
Density (measured):2.92 g/cm3

Crystallography of Isoclasite

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

Optical Data of Isoclasite

Type:Biaxial (+)
RI values: nα = 1.565 nβ = 1.568 nγ = 1.580
2V:Calculated: 54°
Maximum Birefringence:δ = 0.015

Chart 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 Isoclasite

Formula:
Ca
 
2
(PO
 
4
)(OH) · 2H
 
2
O
Essential elements:Ca, H, O, P
All elements listed in formula:Ca, H, O, P
Analytical Data:
CaO (49.51)
P2O5 (29.90)
H2O (20.59)
total (100.00)

Relationship of Isoclasite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DN.05Natrophosphate
Na
 
7
(PO
 
4
)
 
2
F · 19H
 
2
O
8.DN.15Lermontovite
U(PO
 
4
)(OH) · H
 
2
O
8.DN.20Vyacheslavite
U(PO
 
4
)(OH) · nH
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.4.1Monetite
Ca(HPO
 
4
)
19.4.2Hydroxylapatite
Ca
 
5
(PO
 
4
)
 
3
(OH)
19.4.3Brushite
Ca(HPO
 
4
) · 2H
 
2
O
19.4.5Buchwaldite
NaCa(PO
 
4
)
19.4.6Canaphite
Na
 
2
Ca(P
 
2
O
 
7
) · 4H
 
2
O
19.4.7Mundrabillaite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
 · H
 
2
O
19.4.8Whitlockite
Ca
 
9
Mg(PO
 
4
)
 
6
(HPO
 
4
)
19.4.9Brianite
Na
 
2
CaMg(PO
 
4
)
 
2
19.4.10Petersite-(Y)
(Y,Ce,Nd)Cu
 
6
(PO
 
4
)
 
3
(OH)
 
6
 · 3H
 
2
O

Other Names for Isoclasite

Other Languages:
German:Isoclasit
Isoklas
Spanish:Isoclasita

Other Information

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

References for Isoclasite

Reference List:

- +
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 Isoclasite

Search Engines:
  • Look for Isoclasite on Google
  • Look for Isoclasite images on Google
    • Mineral Dealers:
  • Buy fine minerals and gemstones from Pala International
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Search for - Isoclasite - on e-Rocks Mineral Sales & Auctions
  • rare and unusual minerals mainly crystallized
  • Isoclasite specimens for sale - minfind.com
  • The Arkenstone - Fine Minerals
  • Buy minerals from YourMineralCollection
  • Wilensky Fine Minerals
  • Fine Minerals from Weinrich Minerals, Inc.
  • Buy RARE Minerals from Rocks of Africa
  • High-end worldwide specimens & outstanding customer service
  • Top quality minerals from Kristalle of California
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Isoclasite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    Steve Sorrell Collection
      • Flying Fish Cove
    		Steve Sorrell Collection
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov (St Joachimsthal) District
    		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
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 21st Jun 2011 12:38:19
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds