Two main types may be recognized by means of the microscope; the felsitic and the microcrystalline.
2.
The glassy or felsitic enclosures in the quartz are then very suggestive of an igneous origin for the rock.
3.
H�lleflinta under the microscope is very finely crystalline, or even cryptocrystalline, resembling the felsitic matrix of many acid rocks.
4.
The latter are represented by large contemporaneous deposits of tuff and felsitic lava which in the Snowdon District are several thousand feet thick.
5.
The groundmass of these rocks is often aphanitic microcrystalline, with a web of minute feldspars mixed with interstitial grains of quartz or tridymite; but in many dacites it is largely vitreous, while in others it is felsitic or cryptocrystalline.
6.
For several years be worked in this capacity at the museum in Jermyn Street; he described the volcanic rocks of East Somerset and the Bristol district in 1876, and wrote special memoirs on " The Eruptive Rocks of Brent Tor " ( 1878 ) and on " The Felsitic Lavas of England and Wales " ( 1885 ).
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