Krauskopfite (original) (raw)

A valid IMA mineral species

About KrauskopfiteHide

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Colour:

White to colourless

Lustre:

Sub-Vitreous, Pearly

Crystal System:

Monoclinic

Name:

Named in honour of Konrad Bates Krauskopf (November 30, 1910 – May 4, 2003), professor of geochemistry at Stanford University and noted for his work in radioactive waste disposal.

This page provides mineralogical data about Krauskopfite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2271:8

09d517e2-16e4-41dd-8280-a3a20970f28e

IMA Classification of KrauskopfiteHide

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Type description reference:

Classification of KrauskopfiteHide

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9.DH.30

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12

74.3.4.2

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips

14.7.2

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of KrauskopfiteHide

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Transparency:

Transparent, Translucent

Comment:

Pearly on cleavages

Colour:

White to colourless

Cleavage:

Perfect
Perfect on {010} and {001} intersecting at 90°, with a third poor cleavage at a high angle to the other two.

Density:

3.14(2) g/cm3 (Measured) 3.10 g/cm3 (Calculated)

Optical Data of KrauskopfiteHide

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RI values:

_n_α = 1.574(2) _n_β = 1.587(2) _n_γ = 1.599(2)

2V:

Measured: 88° (5), Calculated: 87°

δ = 0.025

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

relatively weak

Optical Extinction:

X = b; Y ∧ a = 6°; Z ∧ c = 10.5°. a ∧ c = 94° 32' +/- 8'.

Chemistry of KrauskopfiteHide

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Mindat Formula:

BaSi2O5 · 3H2O

Common Impurities:

Ti,Al,Fe,Mn,Mg,Ca,Sr,K

Crystallography of KrauskopfiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.460(5) Å, b = 10.622(6) Å, c = 7.837(4) Å
β = 94.53(1)°

Ratio:

a:b:c = 0.796 : 1 : 0.738

Unit Cell V:

702.05 ų (Calculated from Unit Cell)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of KrauskopfiteHide

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General Appearance of Type Material:

Grains without crystal faces.

Place of Conservation of Type Material:

California Division of Mines and Geology, San Francisco, California, USA.

Associated Minerals at Type Locality:

Reference:

Alfors J T, Stinson M C, Matthews R A, Pabst A (1965) Seven new barium minerals from eastern Fresno County, California. American Mineralogist 50, 314-340

Synonyms of KrauskopfiteHide

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Other Language Names for KrauskopfiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Thermal Behaviour:

Gives off water in a closed tube test and fuses at about 5 to a colorless bead.

Heated in an electric furnace, the mineral is stable at 100 °C, but at 300 °C it decrepitates and turns opaque white. At 450 °C it has a total weight loss of 16.7 per cent. There is no further change up to 1200 °C. At 1300 °C., it partially melts to a colorless glass.

Notes:

Readily decomposed by cold dilute acids leaving a white to transparent silica residue. Not affected by weak bases.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for KrauskopfiteHide

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References for KrauskopfiteHide

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Localities for KrauskopfiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.