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Hyalophane from
Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex Co., Connecticut, USA

Classification
Species:Microcline var: Hyalophane
Formula:(K,Ba)[Al(Si,Al)Si2O8]
Comments:"A few nicely formed yellowish hyalophane crystals (adularia type) were found in vugs of spessartine crystals at the Jail Hill quarry in Haddam, associated with a lens of manganese silicates and oxides. Spectrographic analysis indicates the hyalophane is manganoan." Schooner (circa 1985). Crystals reach about 1 cm.
Habit:prismatic
Colour:pale yellow-white
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Infrared Spectroscopy
References
References:Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut minerals.
Associated Minerals Based on Photo Data:
Spessartine1 photo of Hyalophane associated with Spessartine at this locality.
Data
Mineral Data:Click here to view Hyalophane data
Locality Data:Click here to view Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex Co., Connecticut, USA
 
Mineral and/or Locality  
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