Galena

Cubic crystal structure

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Galena typically forms in low-temperature and medium-temperature hydrothermal ore veins that occur in

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igneous rocks

sedimentary rocks

pegmatites

Lubec, Maine, lead mine (from Jackson, 1837)

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As a replacement mineral, galena can be found in sedimentary rocks, either throughout the rock or filling holes in carbonate rocks.

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Galena is the main ore for lead, which has been used by humans for

the past 8500 years

Lead is easy to shape.

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Lead water pipes (Roman)

Lead coin (Roman)

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Lead is still used in decorative pottery, roofing, ammunition, crystal glass, radiation shielding, cables,

batteries, and television and computer monitors.

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This 18th century musket fires 1 ounce of lead.

This 19th century lead bullet is from the war between the states.

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Lead 9mm bullets (with copper casing)

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Lead is in lead crystal

and leaded glass

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Lead-acid batteries are the

back up for servers in case of

a power outage, and in solar

energy systems.

Lead-acid batteries, a type of wet-cell battery, are used in starting engines and powering accessories/machines.

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Lead is used as a radiation shield in

medicine.

Lead aprons are often used at dentists' offices to protect patients from radiation. Staff usually step behind full-body shields.

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Computer monitors and televisions all have a Cathode Ray Tube (CRT) which contains up to 2 pounds of lead.

All CRT televisions and computer monitors must be properly recycled.

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What about flatscreens? Flatscreen monitors do not contain lead, but

they do contain mercury which is dangerous.

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Lead in household items can enter the human body and

cause lead poisoning.

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Lead in ammunition can poison meat, or

can be consumed by other animals in the ecosystem.

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Lead is harmful to the human body. It was banned in paint in 1978, in solder (for cans and water pipes) in 1986, and completely banned in gasoline by 1996.

These bans will prevent many people, especially children,

from becoming poisoned by lead.

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Galena

Cubic crystal structure

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