Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated Formation / Member
Accomack Mudstone				Ranges in color from a light or medium brown to a yellowish mustard brown.	Virginia, Maryland, Delaware	Yorktown and Omar formation estuarine deposits
Antietam Quartzite AKA: Erwin-Antietam Quartzite				Ranges from bright white to light gray, tan, brown, pink, or red, a greenish brown variation is reported	West Virginia, Virginia, Delaware, Maryland, Pennsylvania,	Antietam Formation of the Chilhowee Group
Aquia Orthoquartzite				Ranges from white to tan, light gray, or brown.  Finer grain can range from tan to brown, gray, yellow, or red.	Delaware, Maryland, Pennsylvania, Delaware	Aquia Quartzite Formation
Argillite (Generic type)				Light to dark green, but may range to various shades of gray.	North America	Varies
Beasley Bay Jasper				Ranges from a mustard yellow to a brownish yellow or red.	Virginia, Maryland, Delaware	Kent Island Formation
Brandywine Blue Gneiss AKA: Wilmington Blue Rock				Ranges from a bright blue to a bluish gray.	Delaware, New Jersey, Pennsylvania, Maryland	Brandywine Blue Gneiss Formation of the Wilmington Complex
Broad Run Chalcedony AKA: Wissahickon Chalcedony				Ranges in color from a mottled white to light gray or cream to yellow.  Black specks are present through the material.	Virginia, Delaware, Maryland	Wissahickon Formation
Catoctin Greenstone AKA: Catoctin Metabasalt				Ranges from a green to a greenish gray or gray.	Virginia, West Virginia, Maryland, Pennsylvania, Delaware	Catoctin Formation
Catoctin Metarhyolite AKA: Highland Metarhyolite				Ranges from a gray to a  bluish gray, blue, or purple.  Banding, mottling, or breccia with a tannish color may be present.	West Virginia, Virginia, Delaware, Maryland	Catoctin Formation
Cecil Black Chert AKA: Newark Chert				Ranges from a medium gray to black	Delaware, Maryland, Pennsylvania	Newark Gabbro Formation
Columbia Formation Quartzite				Ranges from a yellowish brown to a reddish brown.	Delaware, Maryland	Columbia Formation
Crystal Quartz				clear colorless stone similar to clear glass	Eastern North America
Cuesta Quartzite				Ranges in color from pale grayish brown, pink, or reddish.	Delaware, New Jersey
Hardyston Chalcedony				Semi translucent milky white to light blue or light to gray.	Maryland, Pennsylvania, New Jersey, Delaware	Hardyston Formation
Hardyston Jasper AKA: Berks Jasper, Lehigh Jasper, Pennsylvania Jasper				Ranges from a dark golden yellow to a bright red or dark brown with mottling as well as tiny veins of clear to white translucent chalcedony.	Maryland, Pennsylvania, New Jersey, Delaware	Hardyston Formation
Hardyston Quartzite				Ranges from a milky white to light blue to a light yellowish brown or gray.	Maryland, Pennsylvania, New Jersey, Delaware	Hardyston Formation
Heath Farm Jasper AKA: Delmarva Peninsula Jasper				Ranges from a brownish to dark brownish black.	Delaware, Maryland, Pennsylvania
Iron Hill Jasper AKA: Newark Jasper				Ranges from a mottled mustard yellow to brown, dark brown, brownish black, and red.	Delaware, Maryland, Pennsylvania	Newark Gabbo Formation
Mogothy Quartzite AKA: Magothy Quartzite				Ranges in color from gray to bluish gray or purple, banding or mottling may be present.  Small fossils may give a peppered appearance.	Virginia, Delaware, Maryland	Mogothy Formation
Onodaga Chert AKA: See page				Vary from light to dark gray to a mottled bluish gray to a dark brown or black or tan.	West Virginia, Virginia, Delaware, Maryland (see page for full list)	Onondaga Limestone Formation
Orthoquartzite (Generic type)				Varies	North America	Varies
Quartz				Milky white with thin veins	North America
Quartzite				Varies from white to gray, or pink and tan in color	North America
Rhyolite				Gray to grayish black, flow banding may be present alternating from light to darker gray	Eastern North America
Wissahickon Quartzite / Vein Quartz				gray quartzite with milky white veins of quartz.	Pennsylvania, New Jersey, Maryland, Delaware	Wissahickon Formation