This well-trimmed matrix features a 2-cm-long crystal of sylvanite. Sylvanite is a very rare silver gold telluride. Large crystals are only known from a few locales, of which the most historic are in the now defunct old mining districts of Romania and in Colorado. Seldom do you see such large crystals, in particular from Colorado. This crystal measures 20 mm in size, and is superbly displayed on a well-trimmed matrix. Minor microscopic purple fluorite is in association. This is a major specimen for the species and locale, far more impactful and important than its physical size would indicate otherwise. From an old collection.