The Arthur Ross Terrace will be closed this morning, Tuesday, October 21, for a private cultural observance. You many observe smoke and/or fire coming from the Terrace at that time. The FDNY has been notified in advance, and all safety precautions are in place. The Terrace will reopen at 1 pm.
This specimen is an example of a mineral that formed in a hydrothermal environment.
A mineral-rich hydrothermal fluid may cool and crystallize at considerable depth with Earth’s crust and at comparatively high temperatures of 300°C to 500°C. in such an environment, a hypothermal mineral-rich deposit is formed.
Hypothermal deposits, like other rock bodies formed deep within Earth, may subsequently be exposed through cycles of erosion lasting millions of years. Common in these deposits are minerals containing metallic elements such as nickel, cobalt, tungsten, arsenic, tin, and other economically valuable elements.