Lithographie, Ltd.

Creator and publisher of the Mineral Monograph series and reseller of natural history titles.

[Lithographie, Ltd. @lithographie]

Agate, Tsumeb, Smale 3, Southern Illinois, and more - https://t.co/5L8hmPeNlW

[American Museum of Natural History @AMNH]

Happy Fossil Friday! Meet Gomphotherium productum, or the “club beast.” This early relative of elephants lived in what is now Texas about 10 million years ago. Unlike many other proboscideans, which had only two tusks, it had interlocking upper and lower tusks.

[Lithographie, Ltd. @lithographie]

New and Upcoming - https://t.co/7Rax8gPOjn

[Lithographie, Ltd. @lithographie]

After a year’s hiatus, our mineral calendar is back for 2025!

Thanks a million to our team for helping put it together. It may seem like a simple thing, but trust me, it’s not!! Grateful!

https://t.co/uyhhsNjAVe

[Lithographie, Ltd. @lithographie]

Bert Ottens' limited edition book "India," is hot off the press! The secondary minerals of the Deccan Traps have rarely been given collector-oriented treatment.

Accepting orders for Sept delivery.

Hardcover, 352 pages, 800+ color illustrations, ~5 pounds, $150

[Nathan Hale @MrNathanHale]

Every few years, someone asks about this illustration. I worked for a museum display company from 2000-2005, where I got to do pieces like this and giant science murals. It was a fascinating time and set me on my path of explaining things with illustration.

[Lithographie, Ltd. @lithographie]

@historyinmemes It is far more common to see a fake of this nature than to see a perfectly posed insect inside a remarkably clear piece of amber. Can you provide a photo credit?

[Lithographie, Ltd. @lithographie]

@MlCHlELMlTCHELL @historyinmemes Such pieces are commonly faked.

[Craig Baird - Canadian History Ehx @CraigBaird]

Did you know that if you are near Hudson Bay, you actually weigh less than if you were somewhere else in the world?

The Hudson Bay gravitational anomaly is about -0.005%. So if you are 150 pounds elsewhere, you will weigh 149.9925 pounds there.

Let's learn why that is!

Part of the reason is that thousands of years ago, Canada was covered by the Laurentide Ice Sheet. This massive ice sheet covered millions of square kilometres and was 3.7 kilometres thick at Hudson Bay. It weighed so much it compressed the ground by hundreds of feet.

The area of Hudson Bay is surrounded by the Canadian Shield, and that rock was compressed by the ice sheet. While the rest of present-day Canada's ground rebounded over the centuries, those compressed rocks have taken much longer, about 12 millimetres per year.

With the mass of the rocks decreased due to the compression, the gravity is also decreased.

This is only part of the reason gravity is lower at Hudson Bay as the compressed rock accounts for 25 to 45% of the gravity anomaly.
The remaining amount is likely caused by what is going on below the earth's surface. Magma rising and falling creates convection currents, which drag down continental plates, decreasing the mass of the area.

This gravity anomaly won't last forever. In about 5,000 years, the 650-foot bounce back will be finished around Hudson Bay.

If you enjoy my Canadian history content, please consider a donation to Canadian History Ehx at https://t.co/u12Dmz8vKv

Sources:
https://t.co/9sJONy1Tlh
https://t.co/DNLRjVta3z
https://t.co/z0lUjUQu9K

[Historic Vids @historyinmemes]

Recent research revealed that this obsidian mirror was used by Queen Elizabeth I's famed political advisor and occultist, John Dee, to 'speak' with angels. It has been determined that the mirror has Aztec origins. Crafted in Mexico over 500 years ago, it most likely ended up in Europe as part of the expeditions led by Hernan Cortes. Currently, the mirror is on display at the British Museum.

John Dee had a diverse range of interests, including astronomy, astrology, alchemy, and mathematics. He served as an advisor to Queen Elizabeth I from the beginning of her reign in 1558 until the 1570s. Dee was also a strong advocate for overseas exploration and the establishment of colonies. Later in his life, he became involved in divination and the occult, seeking to communicate with angels through the use of scryers—individuals who can divine the future—using artifacts such as mirrors and crystals.

Scholars have determined that Dee's mirror, along with another mirror, originated in Pachucha, located just northeast of Mexico City. The third mirror and the slab came from Ucareo, approximately 150 miles west. Both regions were under Aztec control during the early 16th century.

The Aztecs regarded obsidian as a protective material with medicinal properties, viewing its reflective surface as a shield against evil spirits. This volcanic glass was also associated with death, the underworld, and the capturing of a person's image and soul.

Following the invasion of the Aztec capital of Tenochtitlán by forces commanded by Hernán Cortés in 1521, treasures, including obsidian mirrors, were swiftly shipped back to Europe.

[Lithographie, Ltd. @lithographie]

Happy New Year! - https://t.co/7mmZ5iAeBQ

[Lithographie, Ltd. @lithographie]

Great stocking stuffer!

#best$10everspent #2021calendar #agate

[Lithographie, Ltd. @lithographie]

November Update - https://t.co/9dd05LLAOH

[GIA @GIAnews]

Happy Halloween! 💀 Meet Greggory, a life-sized carving of a human skull, with a cranium and a separate mandible, crafted out of 25,190 carats of smoky quartz from Brazil! Photo: Robert Weldon/GIA Collection

[Peter Wilf @RadioGondwana]

Nothing like Eocene Ginkgoites fresh out of the ground at Laguna del Hunco #Chubut #Argentina with @mefpatagonia @leafdoctor @PPaleofloras (2009) #paleobotany @PSUEMS

[American Museum of Natural History @AMNH]

‼️An exciting update about the Museum’s Mignone Halls of Gems & Minerals... are you ready? Here it is: the all-new halls will open on February 17, 2021!

💎Find out more here: https://t.co/ZJPIruP2I8

[Lithographie, Ltd. @lithographie]

Not sure how complicated a Twitter survey can be, but maybe try informally asking people who are planning to vote for each candidate whether they attend rallies, wear candidate-branded clothing, display lawn signs, swag, or simply respond to polling.

@FrankLuntz @freedlander

[Lithographie, Ltd. @lithographie]

@ScottAdamsSays @NateSilver538

Just for fun, how about running a survey along these lines:

Have you ever harassed, blocked, unfriended, fired, silenced, talked over, muted, or otherwise “cancelled” someone who expressed a political opinion that was different from yours?

[Lithographie, Ltd. @lithographie]

@freedlander Why not invite candid conversations with your quiet Trump-supporting friends and family to see what they think about being polled?