Calaveras Gem & Mineral Society

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CGMS Gem & Jewelry Show - March 23 - 24, 2019

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 on: May 04, 2019, 02:06:55 pm 
Started by Andrew - Last post by AltonErurf
Cpoeco oee a eppop Moc ee eaoe oeco aco, oope o a,

 on: February 19, 2019, 04:11:26 pm 
Started by Andrew - Last post by Andrew
Posts in the Events forum are connected to events on the Calendar.

You can view the calendar by clicking the link on the forum menu bar across the top of the page.

Or, use this link:

 on: February 19, 2019, 01:57:34 pm 
Started by Andrew - Last post by Andrew
Mohs Scale of Hardness

The Mohs Scale of Hardness describes the relative hardness of some common minerals -- based on their ability to "scratch" one another.

The unit increments are based on the hardness of (arbitrarily selected) minerals in Mohs' original list. That means they are not linear with respect to absolute hardness. For instance, diamond is 16 times harder than quartz, and the difference between the two in Mohs scale is 3 units. But, the difference between feldspar and quartz is only about 40% in terms of absolute hardness, while they differ by a whole Mohs unit.

Here are the values found on the original Mohs (1812) scale shown alongside "absolute" hardness equivalents.

Mohs HardnessMineralAbsolute Hardness

Moh Hardness of some common items:
ItemMohs Hardness
Paper clip4.5
Steel knife blade5 - 6.5
Copper penny3
Glass6 - 7
Hardened steel file7+


 on: February 19, 2019, 01:27:15 pm 
Started by Andrew - Last post by Andrew
Here are seven key characteristics that may be helpful for identifying unknown rocks and minerals.

  • Color - the color of the material
  • Streak - the color of a crushed mineral when scratched against a white (or black) plate
  • Luster - the pattern and quality of light reflected off the surface of a rock
  • Crystal habit, cleavage and fracture - characteristics of crystal structure, regularly oriented planes of weakness and broken faces
  • Specific gravity - the amount of mass per volume - also known as density or "heft"
  • Hardness - the resistance of a smooth surface to abrasion (scratching); see Mohs scale of Hardness
  • Special properties - Other properties that are important (e.g. odor, UV reactivity, effervescence from chemical agents)

 on: February 19, 2019, 10:38:54 am 
Started by Andrew - Last post by Andrew
February meeting was rescheduled for February 24th, 2019 -- due to inclement weather.

It was decided a general meeting prior to the upcoming show (exactly 1 month out from the meeting) would be a good idea.

There will also be a board meeting at 10AM -- all members are welcome to attend.

 on: February 03, 2019, 01:59:20 pm 
Started by Andrew - Last post by Andrew
Held in the parking lot of the CGMS Clubhouse: 2500 Meacham Ranch Rd. Angels Camp, CA.

For information and/or to sign up to sell, contact Lynn Becker:

 on: February 03, 2019, 01:57:48 pm 
Started by Andrew - Last post by Andrew
February General Meeting & Potluck


 on: February 03, 2019, 12:42:37 pm 
Started by Andrew - Last post by Andrew

WONDJINA RESEARCH INSTITUTE (WRI) is the Research and Development Division of Wombat Mining & Exploration Company (WME), an Arizona company that has served the mineral industry and governmental clients since 1973 and has, independently, successfully completed over 200 projects in the US and overseas.

WRI has recently arranged for the updating of its OLYMPUS DELTA Professional pXRF unit and is offering pXRF Laboratory and Field analysis services by the WRI team of Professional Geologists (AIPG), Registered Professional Archaeologists (RPA) and Professional Chemists to its clients and general public from its Confidence House Office in Twain Harte, California.

Map of past project areas:

Press release:

Richard Lundin, BA, MA, RPA, AIPG
Confidence House
22510 Confidence Rd.
Twain Harte, California 95383
Phone: (209) 586-5632
Cell: (209) 288-8398
FACEBOOK: WondjinaResearchInstitute

WRI has worked on a variety of research projects in Geology, Archaeology, Archaeogeophysics, Archaeogeochemistry, Remote Sensing, and Mineral Exploration/Materials Testing utilizing pXRF technologies in the US and overseas since 1993.

These projects for major mineral industry groups, governmental organizations, environmental organizations, development companies, consulting groups and academic organizations, have led to discoveries of “hidden” mineral deposits, delineation of areas of previously unknown toxic waste sites, discovery and delineation of previously unknown prehistoric and historic era archaeological sites, and the verification of the chemical signatures of archaeological materials and precious metal ores.

For further information, detailed specifications on WRI’s pXRF unit, contact Richard Lundin, BA, MA, RPA, AIPG, at (209) 586-5632 or at or FACEBOOK: WondjinaResearchInstitute


 on: January 06, 2019, 07:26:37 pm 
Started by Andrew - Last post by Andrew
January monthly meeting will be on the third Sunday, January 20th, 2019

 on: January 06, 2019, 06:05:05 pm 
Started by Andrew - Last post by Andrew

September 16, 2001



The undersigned residents of the state of California depose and state:

That he, W.G. Daniel, is the duly elected, qualified and acting President of the Calaveras Gem and Mineral Society, an unincorporated association of the County of Calaveras, state of California with its principal meeting place at Angels Camp, Calaveras County, California.
That she, AwaithaMecham is the duly elected, qualified and acting Secretary of the said Calaveras Gem and Mineral Society, an unincorporated association aforesaid.
That as such officers they have been duly authorized by the association to incorporate under the laws of the state of California and that as such officers they have executed the within Articles of Incorporation.
The name of the corporation is Calaveras Gem and Mineral Society.
That the purpose for which said corporation is formed are to stimulate and encourage the study of the earth and of the gems and minerals therein and thereupon.  The specific purpose of this organization shall be (a) to stimulate interest in the earth sciences and lapidary arts by furthering the knowledge of its members and the public in the earth sciences and lapidary arts by dissemination of the knowledge, methods, and procedures for the study, collection and classification of rocks, minerals and fossils, and (b) the methods to cut alter, fashion, and convert earth sciences specimens for lapidary purposes.
That the corporation is organized pursuant to the General Nonprofit Corporation Law or pursuant to Part 1 of Division 2 of Title 1 of the Corporations Code.  This corporation is a nonprofit public benefit corporation and is not organized for the private gain of any person.  It is organized under the Nonprofit Public Benefit Corporation Law for public and charitable purposes.  This corporation elects to be governedby all of the provisions of the Nonprofit Corporation Law of 1980 not otherwise applicable to it under Part 5 thereof.
The number of directors of said corporation shall be twelve (12) and the names and residences of the persons who are appointed for the first year, and to serve until the election and qualification of their successors are:
W.G. Daniel    Angels Camp, CA     
P.H. Wallace    Murphys, CA     
F.P. Swallow    Angels Camp, CA     
AwaithaMecham    Altaville, CA     
A.L. Mecham    Altaville, CA     
Karl Holden    Turlock, CA     
J.M. Boweraox    Vallacito, CA     
Robert O. Buck    Valley Springs, CA     
Amelia Clifton    Altaville, CA     
James Valente    Angels Camp, CA     
Errol O. Green    Angels Camp, CA     
Clarence Castle    Angels Camp, CA     

That said persons shall be known as directors.
The county in this state where the principal office for the transaction of the business of the corporation is CALAVERAS COUNTY.
That the name of the existing unincorporated association is Calaveras Gem and Mineral Society, organized at Angels Camp, Calaveras County, California, August 18, 1948.

In witness thereof, the undersigned officers of Calaveras Gem and Mineral Society, an unincorporated association, have hereunto set our hands this 10th day of February, 1950.

W G Daniel
President of the Calaveras Gem and
Mineral Society, an unincorporated

Awaitha M Mecham
Secretary of the Calaveras Gem and
Mineral Society, an unincorporated

 (1) The property of this corporation is irrevocably dedicated to public and charitable purposes and no part of the net income or assets of this corporation shall ever inure to the benefit of any director, officer or member thereof or to the benefit of any private person.  (2)  No substantial part of the activities of this corporation shall consist of carrying on propaganda, or otherwise attempting to influence legislation, and the corporation shall not participate or intervene in any political campaign (including the publishing or distribution of statements) on behalf on any candidate for public office.
Upon winding up and dissolution of this corporation, its assets remaining after payment, or provision for payment, of all debts and liabilities or this corporation shall be distributed to a nonprofit fund, foundation, or corporation which is organized and operated exclusively for charitable, educational and/or scientific purposes and which has established its tax exempt status under section 501 (c) (3) of the Internal Revenue Code.

The board of directors has duly approved the foregoing amendment of the Articles of Incorporation.

The foregoing amendments of articles of incorporation have been approved by the required vote of the members.

We further declare under penalty of perjury under the laws of the State of California that the matters set forth in this certificate are true and correct to our own knowledge.
Date:  Sept. 16, 2001

Earl Klein                         
Earl Klein, President

Lucille Grace
Lucille Grace, Secretary

I, Bill Jones, Secretary of State of the State of California, hereby certify:  That the attached transcript of 2 page(s) has been compared with the record on file in this office, of which it purports to be a copy, and that it is full, true and correct.  IN WITNESS WHEREOF, I execute this certificate and affix the Great Seal of the State of California this day of Nov. 27, 2001.

Sue Anne Mecham granted property to the Calaveras Gem and Mineral Society, Inc. on May 27, 1960.  Document 1181 recorded at the request of Archie Mecham on May 31, 1960:  Book 132 Page 143.

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