Iceland spar in fiction

[Ya Sam]

At least in this baroque (and rather Pynchonesque) passage from  A.S. 
Byatt's short story "A Stone Woman"

"She saw dikes of dolerites, in graduated sills, now invading her inner 
arms. But it took weeks of patient watching before, by dint of glancing in 
rapid saccades, she surprised a bubble of rosy barite crystals breaking 
through a vein of fluorspar, and opening into the form known as a desert 
rose, bunched with the ore flowers of blue john. Her metamorphosis obeyed no 
known laws of physics or chemistry: ultramafic black rocks and ghostly 
Iceland spar formed in succession and clung together."

http://www.newyorker.com/fiction/content/articles/031013fi_fiction?031013fi_fiction

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