Judging quality
Value lives in the picture: well-separated, finely branched dendrites in clear host material, ideally forming a recognisable scene. Muddy, crowded inclusions are common.
Chalcedony
Moss Agate
Translucent chalcedony filled with dendritic mineral growths that look like moss, ferns or distant trees. Not banded, so technically not a true agate.
Care
Durable and easy — soap and water.
History & lore
Nineteenth-century collectors called landscape-forming pieces 'scenic agates' and mounted them as miniature paintings.
Cultural history, recorded as tradition rather than as medical or scientific claim.
Common questions about Moss Agate
- What is Moss Agate?
- Translucent chalcedony filled with dendritic mineral growths that look like moss, ferns or distant trees. Not banded, so technically not a true agate.
- How hard is Moss Agate and what is it made of?
- Moss Agate is a Chalcedony-family mineral with the composition SiO2 with chlorite/manganese. It crystallizes in the trigonal system and rates 6.5-7 on the Mohs hardness scale. It occurs in green, colorless, brown.
- Where does Moss Agate come from?
- Notable localities for Moss Agate include India, USA (Montana), Indonesia.
- How do you tell good Moss Agate from filler?
- Value lives in the picture: well-separated, finely branched dendrites in clear host material, ideally forming a recognisable scene. Muddy, crowded inclusions are common.
- How do you care for Moss Agate?
- Durable and easy — soap and water.
See it in person
Photographs only go so far
Both rooms are open six days a week, and there is always someone happy to pull pieces out of the case so you can compare them under the light.