|Mary Nevin Mine|
Saturday, May 25, 2013
Pebble Pups Start Field Trip Season
The Pikes Peak Pebble Pups started their 2013 field trip season by exploring the historic Mary Nevin Mine. Next on the agenda was lunch in the park at Victor. We then went to the American Eagle Mine to look at the modern mining operations. After that we collected lamprophyre.
Lamprophyre occurring in Cripple Creek is a dark gray to black intrusive igneous rock characterized by a porphyritic texture in which large crystals (phenocrysts) of dark, iron-magnesium (mafic) minerals are enclosed in a fine-grained to dense matrix (groundmass). The mafic minerals include biotite, hornblende, augite, or olivine. Lamprophyres are unique because of their low silica content and a high iron, magnesium, and alkali content. Lamprophyres show an affinity to weather and decompose. During historic times gold was concentrated along some of the lamporphyre pipes, such as the Cresson Pipe.
Welcome! This is the gateway to adventure and discovery
Through this blog pebble pups and junior members of the Colorado Springs Mineralogical Society can access their lessons, work on assignments and projects, and receive details about field trips in the Pikes Peak Region. This Internet program is also suitable for young people who are interested in Earth science but do not live near a rock club or gem and mineral society or for young people anywhere who want a deeper dive into these topics. The only requirement is that all participants must be members of the Colorado Springs Mineralogical Society and must fill out the CSMS membership form (under important websites) and send their registration and membership fee in. Steven Veatch is the senior instructor and will need an email from you with your name, address, phone number, and permission from your parents to participate in this program.