. Guide leaflet. y of crystal forms and a variety of coloras pleasing to the eye as they are interesting. Cases 14 and 15 contain the silicates epidote, prelmite, axinite andthe species of the humite group, all of which are represented by char-acteristic series well worth close observation and including among theepidotes and axinites some remarkably fine examples. 24 AMERICAN MUSEUM GUIDE LEAFLET The suite of tourmaline which nearly fills one side of Case 15 isnotable for the richness of its display of this very striking in the foreign occurrences and in those from the United Stat
. Guide leaflet. y of crystal forms and a variety of coloras pleasing to the eye as they are interesting. Cases 14 and 15 contain the silicates epidote, prelmite, axinite andthe species of the humite group, all of which are represented by char-acteristic series well worth close observation and including among theepidotes and axinites some remarkably fine examples. 24 AMERICAN MUSEUM GUIDE LEAFLET The suite of tourmaline which nearly fills one side of Case 15 isnotable for the richness of its display of this very striking in the foreign occurrences and in those from the United Statesthis portion of the collection abounds in beautiful and unusual interesting are the specimens showing unequal distributionof color from Haddam, Conn., from Pala, Calif., and from Elba, Italy. The Zeolite Division of the Hydrous Silicates (Cases 15 and 16)includes some large and finely developed tetragonal crystals of apophvl-lite in single individuals and in large and imposing groups. Here are. EPIDOTK FROM TYROL, AUSTRIA\ radiated group of brilliant, well formed crystals also to be found the oddly shaped aggregates of heulandite and atilbite,some of which resemble sheaves of wheat, the scattered groupings ofchabazite and analcite crystals which often give the appearance ofbeing strewn over a background of dark rock matrix, and the slender,bunched needles of uatrolite, springing from a central nucleus like therays of a sun. The zeolites are essentially minerals of the basaltic ortrap rocks and are mostly to be found in cavities, having been depositedin these cup-like hollows by the evaporation of water solutions. The Mica Division of the Hydrous Silicates, shown in Cases 1(> and17, include minerals which have the distinguishing property of splittingup into thin elastic plates or sheets, as in the familiar example of white THE COLLECTION OF MINERALS mica or isinglass. Many species and subspecies are to be found in theseries displayed, the differentiating c
Size: 1905px × 1312px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
