Alabama gemstone:
Alabama mineral:
Alabama rock:
Alabama soil:

star blue quartz
hematite
marble
bama soil series

Alaska gemstone:
Alaska mineral:

jade
gold

Arizona gemstone:
Arizona mineral:

turquoise
fire agate

Arkansas gem:
Arkansas mineral:
Arkansas rock:
Arkansas soil::

diamond
quartz crystal
bauxite
Stuttgart soil series*

California gemstone:
California mineral:
California rock:

benitoite
gold
serpentine

Colorado gemstone:
Colorado mineral:
Colorado rock:

aquamarine
rhodochrosite
yule marble

Connecticut mineral:

garnet

Delaware mineral:
Delaware soil:

sillimanite
Greenwich Loam

Florida gem:
Florida stone:**
Florida soil:

moonstone
agatized coral
Myakka fine sand

Georgia mineral:
Georgia gem:

staurolite
quartz

Hawaii gem***:

black coral***

Idaho stone or gem:

star garnet

Illinois mineral:
Illinois soil:

fluorite
drummer series

Indiana river:
Indiana stone:

wabash river
Salem limestone

Iowa rock:

geode

Kansas soil:

Harney

Kentucky mineral:*
Kentucky gemstone:
Kentucky rock:
Kentucky soil:

coal *
freshwater pearl
Kentucky agate
Crider soil series

Louisiana mineral:
Louisiana gemstone:

agate
cabachon cut gemstone (ref.)

Maine gemstone:
Maine soil:

tourmaline
Chesuncook soil series

Maryland gem:

Patuxent River Stone

Massachusetts gem:
Massachusetts mineral:
Massachusetts rock:
Massachusetts explorer rock:
Massachusetts historical rock:
Massachusetts building stone:
Massachusetts glacial rock:

rhodonite
babingtonite
Roxbury puddingstone
Dighton rock
Plymouth rock
granite
Rolling Rock (Fall River, MA)

Michigan gem:
Michigan stone:**
Michigan soil:

Chlorastrolite
petoskey stone**
Kalkaska

Minnesota gemstone:
Minnesota soil:

Lake Superior agate
Lester

Mississippi soil:
Mississippi stone:*

Natchez silt loam
petrified wood**

Missouri mineral:
Missouri lithologic emblem:

galena
mozarkite

Montana gemstone 1:
Montana gemstone 2:

sapphire
Montana agate

Nebraska gemstone:
Nebraska river:
Nebraska rock:
Nebraska soil:

blue agate (blue chalcedony)
Platte river
prairie agate
Holdrege series

Nevada gemstone:
Nevada semi-precious gem:
Nevada metal:
Nevada rock:
Nevada soil:

Virgin Valley black fire opal
Nevada turquoise
silver
sandstone
Orovada series

New Hampshire gem::
New Hampshire mineral:
New Hampshire rock:

smoky quartz
beryl
granite

New Jersey

New Mexico gem:

turquoise

New York gem:

wine-red garnet

North Carolina rock:
North Carolina precious stone:

granite
emerald

North Dakota soil:

Williams soil

Ohio gem stone:
Ohio soil (unofficial):

Ohio flint
Miamian

Oklahoma crystal:
Oklahoma rock:
Oklahoma soil:

hourglass selenite crystal
rose rock (barite rose)
port silt loam

Oregon gemstone:
Oregon rock:
Oregon soil:

Oregon sunstone
thunder-egg (Geode)
Jory soil

Pennsylvania soil:

Hazleton soil series

Rhode Island mineral:
Rhode Island rock:

bowenite
cumberlandite

South Carolina gem stone:
South Carolina stone:

amethyst
blue granite

South Dakota mineral - stone:
South Dakota gemstone:
South Dakota soil:

rose quartz
fairburn agate
houdek soil

Tennessee gem:
Tennessee rock:
Tennessee stone:

Tennessee pearl
limesone
agate

Texas gem - gemstone:

TX blue topaz, lone star cut

Utah rock:*
Utah state gem:
Utah state mineral

coal*
topaz
copper

Vermont gem:
Vermont mineral:
Vermont rock:
Vermont rock:
Vermont rock:
Vermont soil:

grossular garnet
talc
granite
marble
slate
Tunbridge soil series

Virginia

Washington gem*:

petrified wood*

West Virginia gem:
West Virginia soil:

chalcedony
Monongahela Silt Loam

Wisconsin mineral
Wisconsin rock:
Wisconsin soil:

galena
red granite
Antigo

Wyoming gemstone:

jade

 
* Coal (the state mineral of Kentucky and the state rock of Utah) is not a mineral, but a fossil fuel. Petrified wood (state gem of Washington and state stone of Mississippi) is neither a gem nor a stone, but also a fossil.

**Michigan state "stone" (petoskey stone) and Florida state "stone" (agatized coral) are actually fossilized corals.

***Hawaii state "gem" (black coral) is the skeleton of a marine animal.

Note: These particular "geological" symbols are also listed on their respective state fossils / dinosaurs list or, in the case of Hawaii's black coral, on the state fish and waterlife list
 

The National Gem Collection by Jeffrey E. Post (Smithsonian Institution)
5 star Review: The Smithsonian Institution's Museum of Natural History holds the world's greatest collection of gems ... in this beautiful book Dr. Jeffrey E. Post, curator of the National Gem and Mineral Collection ... more