Red cap Amethyst cluster

Red Cap Amethyst Quartz Cluster with Hematite Coating

This eye-catching red cap amethyst specimen features a dense cluster of well-formed quartz points coated in a rich iron-derived layer, giving the surface its distinctive deep red to coppery tone. The contrast between the underlying amethyst and the iron-rich outer coating creates a visually striking and geologically informative piece.

The surface is made up of tightly packed crystal terminations, each sharply defined and naturally formed. These points catch and scatter light, producing a subtle metallic shimmer caused by fine hematite particles coating the quartz.

Around the edges and base, natural amethyst is visible beneath the red layer, showing soft purple tones typical of iron-bearing quartz. This transition highlights multiple stages of formation—initial quartz growth followed by later iron-rich mineral deposition.

The overall structure is raw and unpolished, preserving the natural crystal habit. Its elongated, slightly tapered shape gives it a strong display presence, with texture and depth across the entire surface.

🔍 Key Features

Material: Quartz (Amethyst variety) with hematite coating

Formula: SiO₂

Colour: Deep red / copper (hematite) with purple amethyst edges

Cause of Colour: Iron oxide (hematite) coating over quartz crystals

Crystal System: Trigonal

Lustre: Vitreous with metallic sheen from iron coating

Formation: Natural cluster with drusy crystal terminations

Finish: Raw, unpolished

📏 Dimensions

Size: 13 cm x 5.2 cm

Weight: 300 grams

🧪 Geological & Scientific Notes

Amethyst forms when silica-rich fluids crystallise within cavities in volcanic rock. Its purple colour is caused by trace iron within the quartz structure, influenced by natural irradiation.

The red “cap” is created by hematite (Fe₂O₃), an iron oxide mineral deposited from iron-rich fluids during or after crystal growth. This coating gives the piece its bold colour and subtle metallic shimmer.

This specimen captures multiple geological stages in one piece—quartz crystallisation followed by secondary mineral deposition.

🧼 Care Information

Avoid prolonged water exposure (can affect surface coating over time)

Do not use chemicals or ultrasonic cleaners

Dust gently with a soft brush

Handle carefully to protect crystal points