| Reference Type | Journal (article/letter/editorial) |
|---|
| Title | The cause of the colour of Blue John and
other purple fluorites |
|---|
| Journal | Mineralogical Magazine |
|---|
| Authors | Braithwaite, R. S. W. | Author |
|---|
| Flowers, W. T. | Author |
| Haszeldine, R. N. | Author |
| Russell, M. | Author |
| Year | 1973 (December) | Volume | 39 |
|---|
| Issue | 304 |
|---|
| Publisher | Mineralogical Society |
|---|
| Download URL | https://rruff.info/doclib/MinMag/Volume_39/39-304-401.pdf+ |
|---|
| DOI | doi:10.1180/minmag.1973.039.304.03Search in ResearchGate |
|---|
| Generate Citation Formats |
|---|
| Mindat Ref. ID | 6710 | Long-form Identifier | mindat:1:5:6710:6 |
|---|
|
| GUID | 0 |
|---|
| Full Reference | Braithwaite, R. S. W., Flowers, W. T., Haszeldine, R. N., Russell, M. (1973) The cause of the colour of Blue John and
other purple fluorites. Mineralogical Magazine, 39 (304) 401-411 doi:10.1180/minmag.1973.039.304.03 |
|---|
| Plain Text | Braithwaite, R. S. W., Flowers, W. T., Haszeldine, R. N., Russell, M. (1973) The cause of the colour of Blue John and
other purple fluorites. Mineralogical Magazine, 39 (304) 401-411 doi:10.1180/minmag.1973.039.304.03 |
|---|
| In | (1973, December) Mineralogical Magazine Vol. 39 (304) Mineralogical Society |
|---|
| Abstract/Notes | Summary‘Blue John’ andother purple fluorites have been studied by a wide range of techniques. Hydrocarbons are not the cause of the colour of these fluorites. No significant difference in the concentrations of 73 elements between the purple and colourless zones of Blue John has been detected. The spectroscopic and thermal bleaching behaviour of the purple zones is consistent with the presence of ‘colloidal’ calcium as colouring agent, and coloration of fluorites with calcium vapour gives material showing similar properties. The distribution of colour suggests trapping of the calcium in lattice defects along {111} (cleavage) planes through {001} (growth) zones. The ‘colloids’ could be produced by aggregation of calcium atoms liberated by irradiation from sources found in the geological environment of Blue John. The banding could arise from variations in the concentration of lattice defects caused by variations in growth rates of the fluorite. |
|---|
These are possibly similar items as determined by title/reference text matching only.
