Postalco Mineral Key Holder Moss Agate

The Postalco Mineral Key Holder in Moss Agate unites a semi-precious natural stone with a solid brass rod to create an everyday object that feels good in your hand. Moss agate is a form of chalcedony – white or transparent agate with green, sometimes reddish or black inclusions that resemble moss or branches. Held up to the light, the stone reveals its full depth: the layering of transparent and opaque zones makes each piece unmistakable. The stone is neither dyed nor treated – what you see is earth in its original state.

Features

• Linear key organisation instead of a ring: All keys thread onto a solid brass rod and lie in an orderly line – no rattling, no tangling, no rummaging through your keychain.
• Solid brass screw cap: The rod is secured at one end with a screw cap. Keys can be added or removed effortlessly.
• Genuine, untreated natural stone: No dye, no surface treatment. The green inclusions in moss agate are created by natural minerals – chlorite or hornblende – embedded in chalcedony.
• Hand-cut and hand-finished in Japan: Traditional Japanese stonemasons hand-cut and shape each stone individually. Form, pattern and colour distribution vary from piece to piece.
• Living brass: The brass rod darkens over time and is polished by friction at the grip points – the object develops a personal patina that makes its wear a visible part of its surface.
• Cool, smooth tactile feel: The stone lies cool and weighty in your hand; the polished surface provides a rich, calming grip.

Use & Tips

• Position your most-used key at an outer position – so you can find it securely by touch without looking.
• Tighten the screw cap by hand regularly; it can loosen through movement if unused. Don't over-tighten with tools – the brass thread is soft.
• Wipe the stone surface with a slightly damp cloth and dry immediately. No cleaning agents, no abrasives.
• Avoid hard impacts against sharp edges: natural stone can splinter on direct impact. If an edge becomes sharp due to damage, discontinue use.
• The brass requires no special care. If you prefer the natural patina, simply let it age; if you want lustre, polish occasionally with a soft cloth.

For Natural Stone Enthusiasts

Moss agate belongs to the chalcedony family – microcrystalline silicon dioxide with a density of around 2.6 g/cm³ and a Mohs hardness of 6.5 to 7. This makes it robust enough for daily use, though it won't tolerate point impacts. The green inclusions are created by oxidised iron or chlorite that became embedded during crystallisation. Postalco works with traditional Japanese stonemasons for its Mineral Series, each of whom hand-cuts every blank and finishes the surface by hand – no two pieces are identical in form or colour. When you place several specimens side by side, you'll see the natural variation in the material directly.

Technical Specifications