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Chief

Question: What is serpentine?

Question: What is serpentine?

Answer:

Serpentine: A family of silicate minerals rich in magnesium and water, derived from low-temperature alteration or metamorphism of the minerals in ultramafic rocks (intrusive igneous rocks very rich in iron and magnesium and with much less silicon and aluminum than most crustal rocks, most come from the Earth's mantle). Serpentine minerals are light to dark green, commonly varied in hue, and greasy looking; the mineral feels slippery.

Serpentinite: Rocks made up of serpentine minerals are called serpentinite. The Origin of Serpentinite: The origin of serpentinite is inferred to be a metamorphic alteration product of mantle rock or oceanic crustal rock. Grades of Serpentinite: Serpentinite is considered greenschist, a metamorphic facies associated with low temperature, low pressure conditions relative to other grades of metamorphic rocks. Higher pressure metamorphic grades of serpentinite contain glaucophane (a pale bluish-gray to black serpentine mineral that occurs in fibrous to felted aggregate masses). Higher temperature and pressure metamorphic grades contain garnets, pyroxene- and amphibole-minerals and are grouped into a metamorphic class called "eclogite". California Coastal Ranges: The typically green serpentinite that occurs in relative abundance throughout Franciscan rocks in the California Coastal Ranges consists dominantly of "antigorite" (a typically green mineral with a dull, earthy, or frothy texture, but has a soft, soapy feel on some fresh surfaces that may display a conchoidal fracture pattern), lizardite (white to pale gray-green with a platy or scaly texture, typically found on exposed surfaces of antigorite masses), chrysotile (white, pale green to bluish-green, fibrous to frothy-textured masses, commonly occurring in fractures on weathered surfaces), and accessory minerals including chlorite, talc, magnetite, magnesite, and other minerals. Serpentinite Soil: Landscape with serpentinite bedrock tends to have thin or absent soil cover. Serpentinite soil tends to have low levels in all major plant nutrients (particularly calcium), and tend to be rich in magnesium, chromium and nickel - elements that are probably toxic to many plants. Many plants that grow on serpentinite will grow on non-serpentinite soils, but they tend to be crowded out by other species, particularly non-native grasses. However, many non-native grasses and other plants tend not to grow well on serpentinite soil. -- Excerpt from: USGS/NPS Geology in the Parks Website, September 2001, and Stoffer and Messina, 2002, Field-Trip Guide to the Southeastern Foothills of the Santa Cruz Mountains in Santa Clara County, California: USGS Open-File Report 02-121.

 

Source of this FAQ:http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/serpentine.html

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Chief

THE PARTNERSHIP FOR JOHNSON VALLEY HOSTS A STRATEGY MEETING AMONG OFF-HIGHWAY VEHICLE LEADERS

THE PARTNERSHIP FOR JOHNSON VALLEY HOSTS A STRATEGY MEETING AMONG OFF-HIGHWAY VEHICLE LEADERS

The Partnership for Johnson Valley, in the spirit of cooperation, met with off-highway industry leadership to discuss possible Marine Base expansion into Johnson Valley

Glendale, CA - The Partnership For Johnson Valley (PFJV) hosted a two-hour meeting last Wednesday, July 2nd at the California Trail User Coalition’s headquarters to strategize and align communication amongst a multitude of OHV Leaders. The strategy meeting was originally announced June 16th, following a Johnson Valley presentation given by PFJV to many of the same groups of OHV leaders. The purpose of the strategy meeting was to invite the many concerned OHV leaders into a collaborative, trusting and open relationship in an effort to preserve Johnson Valley as an Open Access multiple-use area managed by the Bureau of Land Management (BLM).

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ARRA Newsletter - July 2008

ARRA Newsletter - July 2008

Senate OHV Hearing
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We reported in the last newsletter that the Senate Energy and Natural Resources Committee had scheduled a hearing for June 5th on federal OHV management issues. In preparation for those hearings, ARRA made a number of visits to Senate offices to discuss the importance of OHV recreation on public lands and to answer any questions that Senate staff might have about OHV management issues. We found a great deal of interest and support for OHV recreation and we think this attitude was reflected in the hearing as well.

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Chief

Mineral Facts and FAQ's

From energy, construction, and agriculture, to communications, transportation, and national defense, at home, work, or play, we all use or require minerals and mineral materials every day

What is a mineral ?

A naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties.

What's the difference between a rock and a mineral ?

A rock is an aggregate of one or more minerals; or a body of undifferentiated mineral matter

How do we get minerals ?

Minerals must be mined from the ground, either by surface, underground, or drilling methods. Sand and gravel is usually mined in surface pits or rock is crushed to size, gold is mined in surface pits, underground mines, and in streams and rivers.

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Chief

BRC TESTIFIES BEFORE SENATE COMMITTEE ON ENERGY AND NATURAL RESOURCES

BRC TESTIFIES BEFORE SENATE COMMITTEE ON ENERGY AND NATURAL RESOURCES

Date: 06/05/2008

POCATELLO, ID (June 5) -- Greg Mumm, Executive Director of the BlueRibbon Coalition, testified today before the Senate Committee on Energy and Natural Resources regarding off-highway vehicle management on public lands.

In summarizing his written comments at the hearing, Mumm stated that "BRC recognizes the marked growth in the popularity of OHV recreation over the last several decades...Motorized off-highway vehicles are also used to reach remote areas when taking part in other forms of recreational activity such as hunting, fishing, mountain-biking, and hiking...Virtually every public land user is motorized at some point in their visits to federal lands and it is simply a question of where they depart from their vehicle."

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BRC TO TESTIFY BEFORE SENATE COMMITTEE ON ENERGY & NATURAL RESOURCES

Date: 06/03/2008 POCATELLO, ID (June 3)--Greg Mumm, Executive Director for the BlueRibbon Coalition, was recently invited to testify in front of the Senate Committee on Energy and Natural Resources. The BlueRibbon Coalition (BRC), a leading advocate for responsible management of recreation on public lands, was invited in a formal letter by Senator Jeff Bingaman--Chairman of the Senate Committee on Energy--to testify at the committee hearing. "The purpose of the hearing is to receive testimony regarding off-highway vehicle management on public lands," stated Chairman Jeff Bingaman (D-NM) in his letter. "I am honored to have received the invitation to speak before the Senate Committee," said Mumm. "This is an important time for access interests, and this is a tremendous opportunity for the BlueRibbon Coalition to ensure that the enthusiast voice is heard in Washington, D.C." The Committee's hearing is scheduled for Thursday, June 5, 2008, at 9:30 a.m. in room SD-366 of the Dirksen Senate Office Building. ### The BlueRibbon Coalition is a national recreation group that champions responsible use of public and private lands, and encourages individual environmental stewardship. It represents over 10,000 individual members and 1,200 organization and business members, for a combined total of over 600,000 recreationists nationwide. 1-800-258-3742. www.sharetrails.org

 

ContactsGreg Mumm, BRC Executive Director - Phone: 208-237-1008 - Fax: 208-237-9424 - Email: [email protected] - Webpage: http://www.sharetrails.org/staff/#GregM

 

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Information provided by BlueRibbon Coalition

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