Rock Discoveries

Gems and Minerals in the Garden State: A Hidden Treasure Trove

Gems and Minerals in New Jersey: An Overview

New Jersey may not be known as a top destination for gem and mineral enthusiasts, but the state actually offers a wealth of specimens for those who know where to look. From quartz to prehnite, here is a breakdown of some of the gems and minerals that can be found in the Garden State.


Quartz, amethyst, and citrine are all varieties of the mineral quartz, with different colors due to varying levels of impurities. New Jersey is home to several locations where these minerals can be found, including Passaic County.

One particularly popular site for quartz enthusiasts is Diamond Acres in West Milford, which offers opportunities for digging up white and smoky quartz. Amethyst and citrine can also be found in this area.

Another spot for quartz is the abandoned Houdaille Quarry in Montville, which is known for its large deposits of smoky quartz.

Corundum (Ruby)

Corundum is a mineral that can have a variety of colors, with the red variety known as ruby. While rubies are most often associated with countries such as Myanmar and Sri Lanka, New Jersey also has its own deposits.

The Franklin Mining District in Sussex County is one location where corundum has been found. In particular, the Sterling Hill Mine may yield rubies, along with other minerals such as pyrite and sphalerite.


Carnelian is a type of chalcedony, a mineral made up of microcrystalline quartz. This gemstone is typically reddish-brown in color, and can be found at locations such as Stirling Brook in Middlesex County.


Amber is not technically a mineral, but rather a fossilized resin that can contain traces of plants and animals. New Jersey is particularly known for its amber, which can be found throughout Middlesex County.

One location where amber can be found is Big Brook in Colts Neck, where it can appear in small pieces or even larger chunks. Other areas where amber can be found include Sayreville and Woodbridge.


Opal is a mineral that is popular with collectors due to its iridescent colors. While not as abundant in New Jersey as some other minerals, opal can still be found at certain locations.

One such spot is the Paterson Quarry in Passaic County, which offers opportunities for finding opal in railroad cuts and quarries. The eastern side of the state is also a place to search for opal, particularly in quarries in the Watchung Mountains.


Datolite is a mineral that can be white or a pale green color, and is most commonly found in roadcuts and railroad cuts. One location where datolite can be found is in Passaic County, at the Green Pond Mine in Rockaway Township.


Prehnite is a green mineral that is often referred to as New Jersey’s unofficial state gemstone. This mineral is typically found in roadcuts and quarries, with locations in Passaic County offering opportunities for collection.

One well-known spot for prehnite is the Prospect Park Quarry, which has produced both prehnite and other minerals such as apophyllite and datolite. Agate/Jasper/Chalcedony

Agate, jasper, and chalcedony are all types of microcrystalline quartz, with varying colors and patterns.

These minerals can be found in waterways and quarries throughout New Jersey. Passaic County is one location where agate, jasper, and chalcedony can be found.

Some specific locations to search for these minerals include the Passaic River, the Big Piece Reservoir, and the Pompton Dam. Collectors should keep in mind that obtaining permits may be required for some areas.


Serpentine is a green mineral that is often found in metamorphic outcroppings, such as those in Lake Valhalla. While not as well-known as some other minerals in New Jersey, serpentine can still be a worthwhile find for collectors.

In addition to the Lake Valhalla area, other spots where serpentine can be found include High Point State Park and the Kittatinny Mountains. As with other locations, it is important to be aware of any regulations or required permits before collecting.


In summary, New Jersey has a variety of gems and minerals to offer to those who enjoy collecting and studying them. From quartz to serpentine, there are numerous locations throughout the state where these specimens can be found.

With a little knowledge and some determination, collectors can add to their collections and appreciate the unique geology of New Jersey. In conclusion, New Jersey may not be the first place that comes to mind when thinking about gems and minerals, but the state has a surprising variety to offer.

From quartz to prehnite and beyond, there are many locations to explore for those interested in collecting. By being informed about regulations and best practices for collecting, enthusiasts can pursue their hobby responsibly and enjoy the unique specimens that can be found in the Garden State.


Q: What is the best location in New Jersey for finding quartz? A: Diamond Acres in West Milford is one of the most popular sites for digging up quartz.

Q: What is serpentine, and where can it be found in New Jersey? A:

Serpentine is a green mineral often found in metamorphic outcroppings, such as those in Lake Valhalla, the Kittatinny Mountains, and High Point State Park.

Q: What is prehnite, and where can it be found in New Jersey? A:

Prehnite is a green mineral that is commonly found in roadcuts and quarries throughout New Jersey, including locations in Passaic County such as the Prospect Park Quarry.

Q: Do I need a permit to collect minerals in New Jersey? A: Depending on the location, permits may be required for mineral collection in New Jersey.

It is important to research regulations and obtain necessary permits before collecting. Q: Can I find rubies in New Jersey?

A: Yes, corundum (which can include rubies) has been found in the Franklin Mining District in Sussex County, particularly in the Sterling Hill Mine.

Q: What is the most famous place to collect amber in New Jersey?

A: Big Brook in Colts Neck is one of the most famous places to collect amber in New Jersey.

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