ON DIMORPHOUS BODIES. 195 
List of Pseudomorphous Mineral Substances. 
Name, Form. Replacing. Localities and Authorities. 
RUUANEP, /adtckeccscaccke ubes and octohedrons| Fluor Spar ......+0ss.0e. Cornwall, Devonshire, 
Rochette, Erzgebirge. 
ssreeseeeees] Rhombs. and prisms «..| Calc Spar ...ssssee.e+---| Fontainbleau, Haytor. 
(Haytorite)............ Ob. ? rh. prism ...... «. Sphene, Datholite?...... Haytor, Devonshire. 
eee Cubo octohedrons ......| Galena ............+++++.| Rochette, (Dumont). 
Veeeesceeece Rt. rh. prisms ......... Sulphate of Baryta...... Do. , do. 
a basteccesies Ob. rh. prisms ......... Gypsum(lenticular) ...| Mont Martre. 
Oxide of Tin ......... PYISMS eees.e. Felspar and Quartz......| Cornwall. 
Oxide of Antimony | Rt. rh. prism ........ .--.| Sulphuret (Sb2 $3)......| Saxony, (Kobell). 
Peroxide of Iron Octohedrons .....,......|Magnetic Iron (Fe+Fe)| Do. do. 
(Martite) ana 
Hydrateddo.(Fe+H)| Cubes and do. .........| Iron Pyrites (Fe S,) ...| Do. do. 
Cin ies Rt. rh. prisms....e....00s Carbonate .....scccscsees Styria, Carinthia. 
Pyrolusite Mn ......| Rt. rh. prism sssseseeeeee Manganite (Mn+-H)...| Saxony. 
WPREBRUTO 22. cc senssnc ac, DO cca esa, tir shah 2 Carbonate of Lead...... 
Carbonate of Lead...| Do. scccccsccssccceceseee Sulphate of Lead ...... 
Galena (Blue Lead) Hexagonal prism ...... Chloro Phosphate ...... Cornwall, Brittany. 
Mixture of Carbonate] Reg. octohedrons ...... Galena ...... aesieeb eevee! Do. 
and Phosphate 
Copper Pyrites ...... IPYISTIS. Uidevessenencessvss Lenticular Carbonate | Cornwall. 
yh and Specular Iron 
Malachite, green Car-| Ob. rh. prism............| Blue Carbonate Chessy. 
bonate (Cu°C+H) 2CuC-+H) 
Malachite ............, Reg. octohed. and rh. Red Oxide of Copper...) Do. 
dodecahedrons 
Blue Carbonate...) Do. 3 aees Do. «| Do. 
BIN eles Sa svcneels<sccccesesesbee Mave senshi ae; Anhydrite ........sscc00. Pesey. 
DMs oscidonc2.\ssivesus ceased ccivicedecesose Sulphate of Strontia...} ? 
Sulphate of Baryta...| Rt. and ob. rh. prisms | Carbonate and Baryto | Hexham, Alston. 
Calcite 
Wolfram... Biavevccss Square prisms ......... Tungstate of Lime...... Cornwall, Saxony. 
Prehnite .............. Icositetrahedrons ...... Analcime .......eseseee Dumbarton (4llan). 
Hornstone ....... i Cale Spar ......ccceeeee. Schneeberg, Saxony. 
--+-| Do., Quartz, Pearl Spar| Goepfersgriin Bayreuth. 
OMVINE "2.07. cccaseccusess Snarum, Norway. 
__ 41.Pseudomorphic crystals are generally distinguished from re- 
gularly crystallized bodies by the absence of the external smooth- 
ess and lustre by which true crystals are characterized, by ex- 
ibiting no internal structure or cleavage, unless very rarely 
that of the substance of which they have the external form, and 
frequently by containing cavities or portions of the mineral they 
Teplace. In most of the examples contained in the above list, 
the parasitic formation of the crystals is easily recognized by 
one or more of these tests ; but there are some which betray 
no such marks of their origin, but, on the contrary, possess all 
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