GEOLOGY and EARTH SCIENCE

Introduces glaciers, fossils, rock formation
and erosion, geological structures, plate
tectonics, evolution, atmospherics, astron-
omy & space science. Very rich resource
material, some at OVER 50% DISCOUNT!

ROCK SPECIMENS & CRYSTALS
A rich collection of mineral specimens that do not have to be kept locked up! Always available for projection. 8 pgms,160 slides, information packed guides.56% DISCOUNT
EP #302X SLIDES
$149.95

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SAVE 56% ON 8 SLIDE SET BUNDLE ORDER EP #302X...........$149.95
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(Closeout Pricing--was $340.00)

SEMIPRECIOUS STONES Slides order #302...............$42.50

Program presents breathtaking pictures of noteworthy specimens, their history
and use as gems: opal, rhodorite, beryl, watermelon toumaline, azurite, malachite, lapis
lazuli, serpentine, jade, variscite, rhodochrosite, turquoise, rose quartz, rutile, amethyst,
chrysoprase, chrysocolla, carnelian and agates. 20 slides and guide.

CONTENT SAMPLE: 9367 This lovely pink mineral with black inclusions was
especially valued in Czarist Russia where it was used to produce large carvings. It is called
rhodonite, and its name derives from the Greek word for rose, obviously a reference to its color.
Found in many localities in irregular masses or nodules, it is only rarely found as crystals. Some
of the best known specimens come from Franklin, New Jersey, the source of the specimen
pictured. A quite tough mineral, it is popular for use as book ends, paper weights, carvings and
spheres. Rhodonite is a simple silicate of manganese and is found in metamorphic rocks, often
associated with veins of ore.
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IMPORTANT MINERALS Slides order #303..............$42.50

Commercially or geologically significant minerals, areas of major concentration,
special properties and uses are described. Coverage includes sulfur, pyrite, magnetite,
hematite, barite, beryl, mica, talc, wulfernite, molybdenum, tremolite, quartz, jasper,
agate, calcite, petrified wood, stalactite, Krohnkite and fluorite. 20 slides and guide.

CONTENT SAMPLE: 9408 This is sulfur and it is one of the most commercially
important minerals. Huge quantities are mined annually. North America is the world’s largest
producer. Sulfur typically is formed in the late stages of volcanic activity and is found in the
craters of volcanoes, in areas where there are hot springs, and in sedimentary layers. It is a soft,
light mineral that melts at a relatively low temperature and is often mined by pumping superheated
steam or water into the deposit. This melts the sulfur which is then pumped out in liquid form.
Because it is mined in this way, sulfur is uncommon in its crystal form. Sulfur crystals have the
interesting property of acquiring a negative electric charge when rubbed.

Sulfur is used commercially to produce sulfuric acid, which is used in many industrial and
chemical processes, and also in the making of paper, for the vulcanization of rubber and in the
steel industry. Important sulfur deposits are found in Louisiana and the Gulf Coast area of the U.S.
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BEAUTY OF CRYSTALS Slides order #011-333............$42.50

A fascinating and inspiring range of natural and synthetic crystalline substances
photographed under low microscopic magnification with polarized light. 20 slides and
guide.
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THE BEAUTY OF ROCK SECTIONS Slides order #011-334............$42.50

Identify different chemical elements and minerals present in rock sections with
this slide set. Photographed under polarized light under microscopic magnification, rock
sections show spectacular colors. 20 slides and guide.
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IGNEOUS ROCK SECTIONS Slides order #011-330............$42.50

Thin sections opf common igneous rocks such as granite and basalt, in addition
to more exotic samples such as luxullianite, as seen through a petrological polarizing
microscope. 20 slides and guide.
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METAMORPHIC ROCK SECTIONS Slides order #011-331............$42.50

Photomicrographs of thin sections of both thermal and regional metamorphic
rocks show a wide variety of structures. 20 slides and guide.
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SEDIMENTARY ROCK SECTIONS Slides order #011-332............$42.50

The minerology and textures of sedimentary rocks are illustrated through the use
of thin section photomicrographs. 20 slides and guide.
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ROCK FORMATION Slides order #304 ............$42.50

A series of rock specimens that illustrate sig-nificant formative events in an area's
geologic history, and their causes. Presents evidence of past heating, cooling pressure
changes, folding, etc. 20 slides and guide.

CONTENT SAMPLE: 9440 This odd-looking rock is composed of fragments of
basalt set in a cement of limestone. It formed in a fault, a place where two bodies of basalt slid
past one another, breaking off some fragments. Later on, water containing large amounts of
dissolved limestone flowed through the fault. This flow gradually deposited the limestone that
cemented the basalt fragments together to form this specimen. A rock formed in this manner is
know as a fault breccia.
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~1875-028~ Native sulfur. photo by Charles R. Belinky, Ph.D.

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