A NATURAL SYSTEM IN MINERALOGY. 65 
Trige 1. Pecrourom. Calamine, Thorite, Cerite, Gyrolite, Friedelite, Pyrosmalite, Xonaltite, Plombierite, Diop- 
tase, Pectolite, Datolite, Apophyllite, Okenite ; together with Villarsite, Matricite, Picrosmine, Picrolite, 
and Chrysotile. (Table I.) 
TrisE 2. Prorospatuorp. Danalite, Willemite, Batrachite, Tephroite, Knebelite, Gadolinite, Helvite, Leucophan- 
ite, Wollastonite, Tscheffkinite. (Table IL.) 
Tripp 3. ProrapAMANTOID. Chondrodite, Monticellite, Chrysolite, Phenacite, Bertrandite, Amphibole, Rhodonite, 
Pyroxene, Enstatite, Guarinite, Titanite, Danburite. (Table HI.) 
Trize 4. Prororayzrorn. Thermophyllite, Marmolite, Tale. (Table IV.) 
Tribe 5. Opmiroin. Serpentine, Retinalite, Deweylite, Genthite, Aphrodite, Cerolite, Chrysocolla, Spadaite, Rens- 
selaerite, Sepiolite, Glauconite. (Table V.) 
Trizp 6. Zeourrom. Xanthorthite, Hamelite, Catapleiite, the various Zeolites; with Cancrinite and Ittnerite, 
Edingtonite, Sloanite, Forestite. (Table VI.) 
. Proropprspatnorp. Melilite, Eudialyte, Wohlerite, Humboldtilite, Ilvaite, Geblenite, Sarcolite, Milarite, 
Barylite, Meionite, with Marialite and intermediate Scapolites, Sodalite, Nosite, Hauyne, Lapis-lazuli, 
Leucite, Hyalophane, Orthoclase, Microcline, Nephelite, Paranthite, Eucryptite, Anorthite, Albite and 
intermediate Feldspars, Iolite, Petalite. (Table VII.) 
Tripp 8. PROTOPERADAMANTOID. Pargasite, Keilhauite, Idocrase, Glaucophane, Schorlomite, Garnet, Ægirite, 
Allanite, Beryl, Euclase, Prehnite, Arfvedsonite, Ardennite, Axinite, Epidote, Zoisite, Jadeite, Gas- 
taldite, Acmite, Spodumene, Sapphirine, Staurolite; and the Tourmalines, including Coronite, Schor- 
lite, Aphrizite, Indicolite, Rubellite. (Table VIII.) 
Tribe 9. PRoTOPERPHYLLOID. Astrophyllite, Phlogopite, Pyrosclerite, Penninite, Ripidolite, Prochlorite, Cronste- 
dite, Leuchtenbergite, Venerite, Corundophilite, Biotite, Voigtite, Cryophyllite, Seybertite, Thuringite, 
Jefferisite, Annite, Willcoxite, Chloritoid, Lepidomelane, Zinnwaldite, Oellacherite, Lepidolite, Marga- 
rite, Euphyllite, Cookeite, Damourite, Paragonite, Muscovite. (Table IX.) 
Tripp 10. Pryrrom. Jollyte, Fahlunite, Esmarkite, Bravaisite, Sordavalite, Hygrophilite, Pinite, Cossaite; with 
Palagonite, Tachylite, Pitchstone, and Obsidian. (Table X.) 
Trip 11. Perzeorrrorp. No species known except perhaps Westanite. 
Tree 12. Persparaorn. No species known to represent this tribe except the bismuthic silicates Eulytite, Agri- 
colite, and Bismutoferrite. 
Tree 13. PorapamMaAntoip, Dumortierite, Topaz, Andalusite, Fibrolite, Cyanite, Bucholzite, Xenolite, Wérthite, 
Lyncurite, Malacone, Zircon, Auerbachite, Anthosiderite, (Table XI.) 
Tripp 14. Perpnytiom. Pholerite, Talcosite, Kaolinite, Pyrophyllite. (Table XII.) 
Trine 15. ArGizLoin. Schrôtterite, Collyrite, Allophane, Samoite, Halloysite, Kaolin, Keramite, Hisingerite, Wol- 
chonskoite, Montmorillonite, Chloropal, Cimolite, Smectite. (Table XIII.) 
TRIBE 
“I 
ÿ 4. The subjoined tribal tables include the principal species of each tribe (except 
Tribes 11 and 12, which are not tabulated), their atomic formulas, so far as determined, 
and the values of P and V, as calculated from these—P being the unit-weight or mean 
weight of the oxyd-unit in the species, and V, the volume of this, got by dividing P by 
D = the specific gravity. For the crystalline tribes, the form of the species, when known, 
is designated in these tables in the right hand column, under X ; initial letters being used 
as follows :—I, Isometric; T, Tetragonal ; O, Orthorhombic ; C, Clinorhombic ; A, Anorthic 
or Trictinic ; H, Hexagonal, and R, Rhombohedral. 
§ 5. Prehnite was by Breithaupt included in his order Grammites, and in the order of 
Zeolites by Shephard, following whom, it was, by the author, placed among Zeolitoids. It 
is, however, shown by its volume, hardness, and chemical relations, to be an adamantoid, 
and has accordingly been transferred, in the revised tables, to the eighth tribe. To this 
are now also added glaucophane and gastaldite, two aluminous protopersilicates, whose 
nearest relations are with garnet, epidote and jadeite. The latter species, with P = 16°88 
and D = 3:32, gives V = 5:08; while gastaldite, having the same general formula, with 
P = 1708 and D = 3:04, gives V = 5°61; and dipyre, almost identical in formula, with 
Sec. IIL, 1886. 9. 
