Ludus Helmontii

 


Chemical formula: See septaria

Family: Rock

Status: NA

Display mineral: NON

 

Luminescence:

Longwave UV (365nm) colors:

                        


Yellowish White , White , Bluish White , Pale Yellow , Greenish white ,

Midwave UV (320nm) colors:

                        


Yellowish White , White , Bluish White , Pale Yellow , Greenish white ,

Shortwave UV (254nm) colors:

                        


Yellowish White , White , Bluish White , Pale Yellow , Greenish white ,

 

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Phosphorescence (in the common sense of the term) observable with the naked eye:

Type d'UV

Couleur

Intensité

Fréquence d'observation

UV longs (365nm):

Greenish white

UV moyens (320 nm):

Greenish white

UV courts (254 nm):

Greenish white
 

Comments:

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.)

Activator(s) and spectrum:

Activator(s): ST (Singlet-triplet)-Matière organique en impureté,

No spectrum yet

Best localities for fluorescence (*):

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Ludus helmontii

  http://webmineral.com/data/Ludus helmontii.shtml

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