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About KlaprothiteHide

Martin Heinrich Klaproth
yellowish green to greenish-yellow
Crystal System:
Named in honour of Martin Heinrich Klaproth (1 December 1743 – 1 January 1817), German chemist and discoverer of uranium, zirconium, and cerium.
Dimorph of:
Related to ottohahnite.

Also chemically related to belakovskiite, fermiite, meisserite, oppenheimerite, plášilite, and natrozippeite.

Found together with péligotite and ottohahnite; the three minerals are very similar in terms of physical and chemical properties (colour, fracture, hardness, water solubility, fluorescence); yet klaprothite is distinguished by a perfect cleavage.

The structure is similar to that of péligotite and is based on [(UO2)(SO4)4]6– clusters, with one of the sulphate tetrahedra being doubly (bidentate) linked to UO7 polyhedron; Na-O polyhedra provide two types of linkages: (1) for the clusters, to give thick heteropolyhedral layers, and (2) between the layers, to form the framework. The structural difference between the two minerals lies in the layer-linking Na-O polyhedra.

Note: The name was previously used (see Klaprothite (of Petersen) and Klaprothite (of Beudant)) but in all cases the name was later discredited.

Classification of KlaprothiteHide

Approval Year:

Physical Properties of KlaprothiteHide

yellowish green to greenish-yellow
2½ on Mohs scale
ca. 2.5
{100} and {001}

Chemical Properties of KlaprothiteHide

IMA Formula:

Crystallography of KlaprothiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 9.8271(4) Å, b = 9.7452(3) Å, c = 20.872(1) Å
β = 98.743(7)°
a:b:c = 1.008 : 1 : 2.142
Unit Cell V:
1975.66 ų

X-Ray Powder DiffractionHide

Powder Diffraction Data:

Type Occurrence of KlaprothiteHide

Place of Conservation of Type Material:
Cotype material: collections of (1) the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA (catalogue numbers 65610,
65611, 65612 and 65613), and (2) the Fersman Mineralogical Museum of the Russian Academy

Synonyms of KlaprothiteHide

Fluorescence of KlaprothiteHide

bright bluish-green

Other InformationHide

easily soluble in RT water; Raman spectrum is given (similar to that of péligotite and ottohahnite)
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 KlaprothiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Plášil, J.,Kasatkin, A.V., Marty, J., Čejka, J. (2016) Klaprothite, IMA2015-087. CNMNC Newsletter No. 29, February 2016, 201. Mineralogical Magazine: 80: 199–205.
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. (2016): Klaprothite, péligotite and ottohahnite, three new sodium uranyl sulfate minerals with bidentate UO7-SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 80, (in press); http://forum.amiminerals.it/viewtopic.php?f=5&t=12850 (2016)

Internet Links for KlaprothiteHide

Localities for KlaprothiteHide

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.
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Kampf, A.R., Plášil, J.,Kasatkin,A.V.,Marty, J. and Čejka, J. (2016) Klaprothite, IMA 2015-087. CNMNC Newsletter No. 29, February 2016, page 201; Mineralogical Magazine, 80, 199–205.
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., and Čejka, J. (2018) Markeyite, a new calcium uranyl carbonate mineral from the Markey mine, San Juan County, Utah, USA. Mineralogical Magazine, 82, 1089-1100.
Mineral and/or Locality  
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