+
+

Recommended Interesting Articles

Records

First Trip to the Deepest Part of the Ocean

The Bathyscaphe Trieste carried two hydronauts to the Challenger Deep in 1960 Bathyscaphe Trieste: The Bathyscaphe Trieste lifted out of the water, circa 1958-59. U.S. Naval Historical Center Photograph. On January 23, 1960, Jacques Piccard and Don Walsh boarded the Bathyscaphe Trieste sea vessel and descended to the deepest part of the ocean: The Challenger Deep in the Mariana Trench.
Read More
Minerals

Marcasite

Mineral Properties and Uses Article by: Hobart M. King, Ph.D., RPG Cockscomb Marcasite: Tabular crystals of “cockscomb” marcasite with spear tip terminations, grown on a base of fluorite. This specimen was collected from the Denton Mine, a fluorite producer in Illinois. It measures about 4.1 x 2.0 x 2.
Read More
Maps

South Dakota Physical Map

South Dakota Physical Relief Map: This South Dakota shaded relief map shows the major physical features of the state. For another nice view of the state, see our South Dakota Satellite image. South Dakota on a USA Wall Map South Dakota Delorme Atlas South Dakota on Google Earth South Dakota Topographic Map: This is a generalized topographic map of South Dakota.
Read More
Maps

Map of Maine Cities and Roads

City Maps for Neighboring States: New Hampshire Vermont Maine on a USA Wall Map Maine Delorme Atlas Maine on Google Earth Maine Cities: Cities with populations over 10,000 include: Auburn, Augusta, Bangor, Biddeford, Portland, Saco, South Portland, Waterville and Westbrook. Maine Interstates: North-South interstates include: Interstate 95, Interstate 295 and Interstate 395.
Read More
Minerals

The Streak Test for Minerals

Done by scraping the mineral across an unglazed porcelain streak plate. Article by: Hobart M. King, Ph.D., RPG The Streak Test: Marks, known as "streaks," are produced by scraping mineral specimens across unglazed porcelain plates. On the left, a specimen of pyrite has produced a black streak. On the right, a specimen of rhodochrosite has produced a white streak.
Read More
Gemstones

Gems from Space

A few rare gem materials are pieces of extraterrestrial objects or are a product of their impacts. Author: Hobart M. King, Ph.D., GIA Graduate Gemologist Moldavite: Moldavite (also called vltavin or Bouteille Stone) is an amorphous glassy material, a mineraloid, that is usually olive green in color. It is thought to have formed during an asteroid impact about 15 million years ago in central Europe.
Read More