Deep Earth subject of Tues., June 15 Virtual Program Meeting

Join us Tuesday, June 15 for a journey through the deep Earth, with Dr. Krista Sawchuk. The deep Earth, which encompasses the mantle and core, makes up 99% of our planet. Because we can’t physically go to the deep Earth, scientists employ a variety of techniques to learn more about it. Dr. Sawchuk will share what we do know about the deep Earth and how her research on the behavior of minerals at high pressures and temperatures is helping us learn more about the chemistry of the mantle.

Dr. Sawchuk recently graduated from UCLA with a PhD in geochemistry. Her dissertation research focused on the high-pressure behavior and chemical reactions of volatile-bearing minerals in Earth’s mantle. Since graduating, she started a postdoctoral research
position at Los Alamos National Lab in New Mexico where she continues her high-pressure research. In her spare time she enjoys mineral collecting and curating her personal mineral collection.

The Tuesday, June 15 program meeting starts at 6:30 p.m. via Zoom. To join us, send an email to joenmar1[at]verizon.net in advance, using ‘PROGRAM MEETING’ in subject line, and request the Zoom meeting link. We hope to “see” you there!

Actinolite Field Trip to Wrightwood, Saturday, June 19th, 2021

Get ready for another collecting adventure for actinolite and rhodonite in the Wrightwood area.  This is a local trip suitable for passenger cars.   We’ll be searching the washes and canyons in this area.  Light hiking is required for this trip.  For more details, please email me at rexch8@yahoo.com with the subject “Wrightwood Field Trip.”

A Geologic Tour of Australia, via Zoom, is featured presentation for Tues., May 18 Program Meeting; 6:30 p.m.

Join us for our May 18 Program Meeting as we explore Australia’s most iconic natural wonders and visit several geologic sites that are unfamiliar to most people. Our guests, Dick & Mary Pat Weber, are retired exploration geologists and will take us on the armchair trip. In 2007 and 2008 they spent a year on what they refer to as their “Rocks ‘n Crocs” tour of Australia looking at and photographing the natural features and geology of the largest country in Oceania.

For our May Rock of the Month talk, Mary Pat Weber will present an introduction to a lesser known member of the garnet family, the rare and highly prized green garnet, which gives emerald a run for its money.

The Tuesday, May 18 program meeting starts at 6:30 p.m. via Zoom. To join us, send an email to joenmar1[at]verizon.net in advance, using ‘PROGRAM MEETING’ in subject line, and request the Zoom meeting link. We hope to “see” you there!

Eastern Sierra Field Trip Saturday, May 15th, 2021

Forsaking the desert, we’ll head deep into the forests of the Sierra Nevada Mountains. The PLS May field trip will be to the Obsidian Dome area where we will study the products of volcanic activity near Mammoth Lakes, CA. Geologically speaking, this volcanic activity is thought to have occurred fairly recently in the summer of 1350AD. This is a one day trip.

We will start at Obsidian Dome–a plateau with some small hills on top, littered with various sized pieces of obsidian. Most of the obsidian pieces at the Dome have tiny gas bubbles and aren’t gem quality but the shiny glass pieces almost glow in the morning sun.  

We’ll head to Crowley Lake after touring the Dome to look for fist size chunks of obsidian and arrowheads in the hills overlooking the reservoir.

After that, we’ll stop at Hot Creek visitor center, visit the free hot tubs in the area and hopefully explore some mine tailings looking for minerals related to gold mining.

High clearance is recommended for this trip.

For more information, please contact Rex at rexch8@yahoo.com.  Please put “Obsidian Dome field trip” in your subject line.

April 16-17, 2021 Field Trip to Tecopa/Sperry Wash

We’ll be rock hunting near Sperry Wash in Tecopa, CA on Friday and Saturday, April 16 and 17. We’ll camp out on Thursday and Friday nights. Saturday night camping is optional . A high clearance (SUV or pickup truck) is required for this trip.   

There will be plenty of variety on this trip, as we’re searching for amethyst, precious opal, fossils, and palm root agate. Please RSVP to Rex at rexch8@yahoo.com for updates and additional information.

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Check out our latest new find! A most unusual pattern of Sperry Wash Jasper
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Tecopa fire opal

Obsidian Featured Presentation for Tuesday, April 20, 2021 Program Meeting; 6:30 p.m.

Obsidian is a popular lapidary material to collect and cut. Join Pasadena Lapidary Society at the April general meeting, as lapidary artist Terry Wilson takes us on a virtual trip to Davis Creek and other obsidian collecting locations, updating us on collecting site regulations. Terry will share tips on how to inspect the obsidian in the field and back at home. She will also demonstrate how to line up, slab and cab the material to bring out the best of their unique optical properties, including how to cut a cab exhibiting the cat-eye effect.

Obsidian with Silver sheen banding.
Snowflake Obsidian

The April Rock of the Month will be presented by geologist, Dick Weber.  Dick will take us on a tour of a hidden treasure: the Petrified Wood museum of Nebraska.

Join us virtually for the April 20 Tuesday night meeting by RSVPing to joenmar1[at]verizon.net for a Zoom meeting link, using ‘PROGRAM MEETING’ in subject line.

March 13 Sidewinder/Ord Mtn fieldtrip

Attendees of Pasadena Lapidary Society’s fieldtrip of Saturday, March 13 collected tricolor marble from the Sidewinder Mtn area and copper minerals from Ord Mountain.

Chrysocolla on quartz found vicinity of Ord Mtn.
Malachite on Cuprite and Quartz


Parked and ready to rock(hound). Vicinity of Ord Mountain.

Old mine shaft; Ord Mountain.

Careful collecting on hillside; Ord Mtn area.

Explore the Geologic Diversity of New Zealand; Virtual Program Meeting March 16, 2021, 6:30 pm

Pasadena Lapidary Society’s Tuesday, March 16 program meeting will feature geologists Dick and Mary Pat Weber, whose presentation will focus on the geological wonder of New Zealand. From volcanoes to glaciers, caves and fjords, finding so much variety of terrain in such a small geographical area would be impossible anywhere else on Earth.

The Webers are exploration geologists who spent a month in 2007 visiting every corner of this tiny island nation; they have worked and travelled extensively in North America, Australia and New Zealand.

Our program meeting will also feature the Rock of the Month, by PLS member David Lacey, whose presentations are always informative.

Interested in joining us virtually for Tuesday night’s meeting? Then RSVP to joenmar1[at]verizon.net for a Zoom meeting link, using ‘PROGRAM MEETING’ in subject line.

March 13, 2021 Field Trip to Sidewinder/Ord Mountain

March’s field trip will be a return to the Sidewinder Mountains.  High clearance or short wheelbase vehicles are recommended for this trip. 2wd is okay. Those with passenger vehicles might need to be shuttled when we get close to the collecting sites. We’ll be searching for both tri-color marble (pictured above) and blue marble.  Tri-color marble is a beautiful green, black, and white material and is perfect for yard rock and spheres.  It’s also a good beginner material for making cabochons. We’ll also explore tailings piles in the Ord Mountains for chrysocolla and malachite.  copper minerals

Our last stop will be to the Prime Cut Rock Show in Lucerne Valley.

Please email Rex at rexch8@yahoo.com for updates and additional information.

Focus on Ametrine for Tuesday, February 16th

Join us for our next virtual general meeting on Tuesday, February 16th. We will be joined by our friend, Professor George R. Rossman. Professor Rossman will highlight the troubled history of Ametrine. Specifically, he will discuss the controversy that developed about ametrine early on, and his personal experience traveling to Brazil amethyst mines, the Bolivia ametrine mine, and Russia where synthetic ametrine was produced. RSVP to joenmar1[at]verizon.net for a Zoom meeting link, using ‘AMETRINE’ in subject line.

The Rock of the Month will be presented by PLS member Phil Lahr, who will discuss “Tumbling through the Pandemic” – a personal journey of rock tumbling triumphs and tragedies during the summer of 2020.