| Collector Specimen Matches |
| US |
| New Jersey |
| Unusual! Tremolite and Calcite Franklin New Jersey! Ex. Albanese, Howard Moore - Franklin, NJ US |
| Nevada |
| Mw: HOWARDITE Jasper-Agate -Nevada- Face Cut Rough - , NV US |
| Mw: HOWARDITE Jasper-Agate -Nevada- Rough Slab - , NV US |
| Premium Howardite Slab Petrified Wood Nevada A Grade 4" X 2" X 1/4" 58 Grams - , NV US |
| Howardite agate old stock lapidary material Rare Nevada slab set - , NV US |
| ORCA: Fantastic Rare Old & New Howardite Slabs, Nevada - , NV US |
| Rare Howardite Petrified Wood Agate Slab Nevada 3.4" X 1.5" X 1/4" 30 Grams - , NV US |
| ORCA: Fantastic Rare Howardite Slab, Nevada - , NV US |
| Rare Howardite Petrified Wood Agate Slab Nevada 2.8" X 2.1" X 1/4"+ 65 Grams - , NV US |
| ORCA: Fantastic Rare Howardite Slab, Nevada - , NV US |
| ORCA: Fantastic Rare Howardite Slab, Nevada - , NV US |
