PLATE VII. 
Figs. 1—8.—Zeolitic Minerals. 
1. Leucile , crystallised as a trapezohedron, which is for this reason also called a leucitoid. Pearl-grey, from the 
ancient lava of Vesuvius. 
2. Natrolite , radiated, with concentric rings, and marked yellow, red, and white, on clinkstone, in splinters of phonolite, 
from Hohentwiel in Swabia. 
3. Crystallised Zeolite , or Mesotype , right rhombic prism, with four bevelled planes (rhombic octahedron), colourless and 
transparent, from Auvergne. 
4. Heulandite , oblique rhombic prism, with truncation of the acute lateral, and basal edges. 
5. Stilbite, or Foliated Zeolite , right rectangular prisms, with truncation of the basal angles (rhombic octahedron) in 
wedge-shaped aggregations of lamella', from the amygdaloid of the Faroe Islands. 
6. Analcime , primary form, a cube with triple truncation of the acute angles (leucitoid), from the amygdaloid of the 
Alps in the South Tyrol. 
7. Apophyllite , quadratic prism, the primary form, with truncation of the angles (square octahedron), as it occurs at 
Andreasberg in the Harz Mountains of a rose-red colour, and at the Faroes colourless. 
8. The same, of a tabular form, combination of the quadratic octahedron with the lower quadratic prism, the so-called 
ichthyophthalmite , or fishes-eyes-stone, from the Fassathal in the South Tyrol. 
Figs. 9—18.—Carbonaceous Limestone. 
9. Calcareous Spar , or calcite , primary form, a hexagonal rhombohedron, a fragment of double refracting Icelandic spar. 
10. The same , with truncation of the vertical edges, combination of the intermediate with the obtuse rhombohedron, from 
Munsterthal in Baden. 
11. The same , a hexagonal double pyramid, with unlike edges, scalenohedron, from a splinter of the mussel-chalk at 
Canstatt. 
12. Calcareous Spar , acute rhombohedron, as it frequently occurs in veins at the Schwarzwald and Erzgebirge in 
Saxony, and mingled with fine quartz sand at Fontainebleau (the so-called sandstone crystals of Fontainebleau). 
13. The same , secondary rhombohedron, with truncation of all the basal angles (hexagonal prism), from Andreasberg in 
the Hai'z Mountains. 
14. The same , a six-sided double pyramid, twins, with dissimilar edges, united horizontally, from Canstatt. 
15. Fibrous Calcite , dragonite , streaked red, yellow, and white, and polished, the so-called thermal tufa ( Sprudelstein ), 
from Carlsbad. 
16. Flos Ferri (flower of iron), or fibrous arragonite, bluish-white, sometimes of a silvery lustre, branched and aggregated 
like coral, from the clefts of spathic ironstone in Styria. 
17. Stalactite , peg-shaped calcite of radiated structure, from the fossiliferous mussel-chalk at Wieslock in Baden. 
18. Pea-Stone , globular, partly calcareous stalactite, containing red or iron ochre, the peas formed in concentric layers, 
from the hot-springs of Carlsbad. 
