Chemical Formula:See septaria
Familly: Rock
Status:
Mineral for Display: No
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Yellowish White | Mid waves (320 nm): | Yellowish White | Short Waves (254 nm): | Yellowish White |
Other colors LW: | White , Bluish White , Pale Yellow , Greenish white , | ||
Other colors MW: | White , Bluish White , Pale Yellow , Greenish white , | ||
Other colors SW: | White , Bluish White , Pale Yellow , Greenish white , |
UV Type | Color | Intensity | Observation Frequency |
---|---|---|---|
Long Wave (365nm): | Greenish white | Mid Waves (320 nm): | Greenish white | Short Waves (254 nm): | Greenish white |
Ludus helmontii is an old synonym for septaria. (see picture of the label of the specimen) Ludus Helmontii Stellatus: septaria from the Kent (UK) containing fibroradiated xls of Baryte. (Chambers Encyclopedia) Ludus Helmontii : (From its resemblance to a die). A roundish mass, which seems to have cracked in drying, and the interstices to be filled up by a calcareous matter, which frequently rises above the surface. The whole is an argillaceous clay, and the mass consists of prisms of different sizes separated by the calcareous matter. See Hauy, iv. 455. (from the book The London Medical Dictionary, by Bartholomew Parr.)
Most Common Activator: Organic impurities
No spectrum for the moment(*)Data are not exhaustive and are limited to the most important localities for fluorescence
http://www.mindat.org/show.php?name=Ludus helmontii
http://webmineral.com/data/Ludus helmontii.shtml
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