Locality: Rare Metals Mine, Mohave County, Arizona, USA
10% to 30% thorium by mass
0.5% to 3% uranium by mass
Monazite-(Ce) is a radioactive rare-earth phosphate mineral found around the world and is radioactive due to the presence of thorium and uranium within its crystal structure. It forms prismatic crystals with striated surfaces, typically measuring a few millimeters to a few centimeters. The color of these crystals varies, but they often display shades of brown, reddish-brown, or yellow-brown. Some crystals may exhibit a translucent to transparent appearance, allowing light to pass through and creating a beautiful play of colors. The luster of monazite-(Ce) is usually vitreous or resinous, enhancing its overall visual appeal.
These crystals are known for their high cerium content, which gives them their specific name, monazite-(Ce). Additionally, they contain other rare-earth elements such as lanthanum, neodymium, and praseodymium. These elements contribute to the crystal’s unique properties and make it a sought-after specimen among collectors and researchers.
This listing meets the requirements of NRC 10 CFR 40.22
It also meets U.S.P.S domestic shipping requirements for exempt limited quantities of class 7 materials according to –347.22 “are eligible under 49 CFR to be shipped as excepted packages for limited quantities” and –Exhibit 347.22 Activity Limits– and also –173.435– Table of A1 and A2 values
Geiger counter is not included
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