Calvin College Chimes

Mineral spotlight: Autunite

Daniel Blakemore

February 24, 2017

Filed under Science & Technology

Autunite is a wonderful mineral for several reasons. First and most obviously is the distinctive bright lime-green color and unusual rectangular tabular crystal habit it can achieve — resembling sheets in a book. Autunite is...

Mineral spotlight: corundum

Daniel Blakemore

November 11, 2016

Filed under Science & Technology

Better known from its colored varieties, ruby and sapphire, corundum is a highly appealing mineral for both decorative and industrial use. The bright, deep colors along with its rarity and high hardness has made it an excellent...

Mineral spotlight: apatite

Daniel Blakemore

October 28, 2016

Filed under Science & Technology

Daniel Blakemore Mineral Spotlight: Apatite Apatite is one of the most important minerals in modern society, yet many people are unaware of its incredible utility. Apatite is not a single mineral species but a large su...

Mineral spotlight: wulfenite

Daniel Blakemore

October 16, 2016

Filed under Science & Technology

Wulfenite is a mineral which may be unfamiliar to the novice geologist, but is highly prized by mineral collectors. No other mineral has the strange combination of a vibrant orange color and fiercely sharp rectangular crystals. Alt...

Mineral Spotlight: Trinitite

Daniel Blakemore

April 27, 2016

Filed under Science & Technology

No substance on Earth better represents humanity’s incredible power over the Earth more than trinitite. Trinitite is not a mineral; it has no crystal structure and is not naturally occurring. However, it serves as an import...

Mineral Spotlight: Galena

Daniel Blakemore

April 21, 2016

Filed under Science & Technology

Galena is by far the most abundant ore of lead and has been smelted for centuries to produce this soft, versatile metal. The United States is one of the leading producers of lead in the world, with prominent mines in Colorado, Id...

Mineral Spotlight: Cinnabar

Daniel Blakemore

March 30, 2016

Filed under Science & Technology

Cinnabar has been mined for thousands of years as it is the main ore of mercury. Its name is derived from the Arabic word “Zinjafr,” meaning dragon's blood, appropriate given the mineral’s blood red color. Cinnabar historically has been ...