|Anthracite.| Siderite. | Rock-salt. | : :Syenite. Norite. : | | Graphite. | | Phosphate | : : .............. : | |Asphaltum. | | Rock. | : : : : : | +-----------+-----------+------------+-------------------------------------+ | Non-Feldspathic. | +-----------+-----------+------------+-------------------------------------+ | |_Siliceous | | : Mica Schist. : : | | | group._ | |........................... : | | +-----------+ | : : : : : | | |Tripolite. | | :Hornbl. Schist. Amphibolite. | | | Flint. | | :.............. ........: | | | Siliceous | | : : : : : | | | Tufa. | | : Talc Schist. :Chl. Schist. | | |Novaculite.| | : :........ : ..........| | | | | : : : : : | | | | | : : Greensand. Serpentine. | | | | | : : ........... ........ | | | | | : : : : : | +-----------+-----------+------------+-------------------------------------+ | Eruptive or Unstratified Rocks. | +------------------------------------+-------------------------------------+ | | PLUTONIC. | | | Feldspathic. | | +-------------------------------------+ | | : Granite. : Diorite. : | | |.................. ........ : | | | : : : : : | | | : : Syenite. Diabase. | | | : : ....... .......: | | | : : : : : | | +-------------------------------------+ | | VOLCANIC. | |This part of the classification | Feldspathic. | |is a blank, for the reason that +-------------------------------------+ |no eruptive rocks are known | :Rhyolite. : Andesite. : | |which are chiefly composed of |........................... : | |minerals belonging to the classes | : : : : : | |of Native Elements, Chlorides, | : : Trachyte. Basalt. |