Hopin #1 mine, Amboy, San Bernardino Co., California, USA
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List of minerals arranged by Dana 8th Edition classification
|Group 74 - PHYLLOSILICATES Modulated Layers|
|Modulated Layers with joined strips|
|Sepiolite||74.3.1b.1||Mg4(Si6O15)(OH)2 · 6H2O|
|Group 75 - TECTOSILICATES Si Tetrahedral Frameworks|
|Si Tetrahedral Frameworks - SiO2 with  coordinated Si|
2 entries listed. 2 valid minerals.