. Guide leaflet. M FELOSBANYA, RUMANIAA radiated aggregate of flat crystals prisms i( use (), the varied series of galena, sphalerite and chalet>pyritespecimens ((ases 2 and 3), the wide range of pyrite specimens, showingmany complex and highly modified crystals (Case 3), and the excep-tionally fine series of proustilc pyrargyrite, tetrahedrite and enargite((ases 3 and 4). This division also includes many rarer minerals innotable specimens, such as ullmannite, sylvanite. einplectite. hinnite,cosalite, bournonite, jordanite and stephanite. THE COLLECTION OF MINERALS 11 HALOIDS(lases 4 and G
. Guide leaflet. M FELOSBANYA, RUMANIAA radiated aggregate of flat crystals prisms i( use (), the varied series of galena, sphalerite and chalet>pyritespecimens ((ases 2 and 3), the wide range of pyrite specimens, showingmany complex and highly modified crystals (Case 3), and the excep-tionally fine series of proustilc pyrargyrite, tetrahedrite and enargite((ases 3 and 4). This division also includes many rarer minerals innotable specimens, such as ullmannite, sylvanite. einplectite. hinnite,cosalite, bournonite, jordanite and stephanite. THE COLLECTION OF MINERALS 11 HALOIDS(lases 4 and G This division of minerals includes the compounds of the metalswith elements of the chlorine roups, the latter being known as halogenelements and comprising chlorine, bromine, iodine and fluorine. Thesegive the chemical compounds called chlorides, bromides, iodides andfluorides. Some of the haloids, as exemplified by the mineral halite or rocksalt, the chloride of sodium, occur in nature in extensive beds and have. FLUORITE FROM CUMBERLAND, ENGLANDEncrusted with quartz on t he edges and corners of I he cubic crysl als been deposited by evaporation from bodies of water which have intimes past been cut off from the main body of the ocean. The seriesof halite specimens in Case 4 includes many striking examples of largeand well-developed crystals. The most widely distributed mineral in this division is fluorite, thefluoride of calcium. This is essentially a vein mineral and is frequentlyfound associated with the sulphide ores of lead and zinc. The largecubic and octahedral crystals of fluorite from all parts of the worldshown in Cases 4 and G, illustrate the very great variation in color
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
