Trenggalek chalcedony hills

Where: East Java · Asia · approx. -8.1, 111.6 (vicinity only)

Why this spot: Silicified zones in Southern Mountains volcanics dug from hillside pits for chalcedony and jasper

What turns up: chalcedony, carnelian, jasper, druzy quartz

Access: Gray area.

Pits are on village and forest land, arrangements are informal and local.

Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.