Quartz vein outcrop, St David's Head, Pembrokeshire (Dyfed), Wales, UK
List of minerals arranged by Dana 8th Edition classification
|Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings|
|Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings|
|Group 75 - TECTOSILICATES Si Tetrahedral Frameworks|
|Si Tetrahedral Frameworks - SiO2 with  coordinated Si|
2 entries listed. 2 valid minerals.
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