Browse Private Gallery

Explore museum-quality mineral specimens from around the world. Each piece has been carefully selected by Grant Powell for its exceptional beauty, rarity, and scientific significance.

36 specimens
Phlogopite (Mica) – Gem Green Crystal on White Dolomitic Marble

Cassiterite

Phlogopite (Mica) – Gem Green Crystal on White Dolomitic Marble

Cassiterite - World-Class Translucent Twin, Sculptural Masterpiece

Cassiterite

Cassiterite - World-Class Translucent Twin, Sculptural Masterpiece

Amo Tin (Sn) Deposit, Ximeng County, Yunnan Provin...

Chalcopyrite – Electric Peacock Iridescence, Sculptural Botryoidal Form

Chalcopyrite

Chalcopyrite – Electric Peacock Iridescence, Sculptural Botryoidal Form

Tongshankou Mine, Daye Co., Huangshi, Hubei Provin...

Zincite - Cathedral of Fire, Monumental Crimson Spire Cluster

Zincite

Zincite - Cathedral of Fire, Monumental Crimson Spire Cluster

Zinc Smelting District, Silesian Voivodeship, Pola...

Quartz Gwindel - Museum Grade, Exceptionally Rare Locale (Brazil)

Quartz

Quartz Gwindel - Museum Grade, Exceptionally Rare Locale (Brazil)

Serra da Mangabeira, Paramirim, Bahia, Brazil (Dir...

Quartz - Radiant Scepter of Sculptural Needle Cluster

Quartz

Quartz - Radiant Scepter of Sculptural Needle Cluster

Santander Department, Colombia

Pyrite - Large, Lustrous, Dodecahedral Specimen

Pyrite

Pyrite - Large, Lustrous, Dodecahedral Specimen

Huanzala Mine, Peru

Creedite - Radiating Peach Crystals

Creedite

Creedite - Radiating Peach Crystals

Navidad Mine, Indé Municipality, Durango, Mexico

Fluorite - Gem-Clear Pale Green Cluster

Fluorite

Fluorite - Gem-Clear Pale Green Cluster

Xia Huang Pu Mine, Chenzhou Prefecture, Hunan Prov...

Pink Calcite - Gem-Zoned, Manganese-Bearing Classic

Calcite

Pink Calcite - Gem-Zoned, Manganese-Bearing Classic

Empire State Zinc Mine (Balmat District), New York...

Celestine on Golden Calcite - Perfect Termination, Color and Form

Celestine / Celestite

Celestine on Golden Calcite - Perfect Termination, Color and Form

Dara-i-Laman, Badghis Province, Afghanistan

Viitaniemiite - Large, Well-Formed Crystal

Viitaniemiite

Viitaniemiite - Large, Well-Formed Crystal

Chhappu, Braldu Valley, Shigar District, Gilgit-Ba...

Achroite Tourmaline - Near-Colorless - Exceptional Stacked Crystal Group

Tourmaline (Elbaite)

Achroite Tourmaline - Near-Colorless - Exceptional Stacked Crystal Group

Chhappu, Braldu Valley, Shigar District, Gilgit-Ba...

Arsenopyrite - Rainbow-Iridescent - Iconic Single-Pocket Specimen

Arsenopyrite

Arsenopyrite - Rainbow-Iridescent - Iconic Single-Pocket Specimen

Yaogangxian Mine, Chenzhou District, Hunan Provinc...

Quartz var. Herkimer Diamond - World-Class Specimen On Matrix With Dolomite

Quartz

Quartz var. Herkimer Diamond - World-Class Specimen On Matrix With Dolomite

Ace of Diamonds Mine, Herkimer County, New York

Siderite - Gem Scalenohedral / Dogtooth Crystals - Tsumeb

Siderite

Siderite - Gem Scalenohedral / Dogtooth Crystals - Tsumeb

Tsumeb Mine, Namibia

Fluorite - Museum-Grade Sky-Blue Crystal Group - La Viesca

Fluorite

Fluorite - Museum-Grade Sky-Blue Crystal Group - La Viesca

La Viesca Mine, Huergo, Siero, Asturias, Spain

Hambergite - ex. MIM Musem, Exceptional Clarity

Hambergite

Hambergite - ex. MIM Musem, Exceptional Clarity

Shengus, Haramosh Mountains, Skardu District, Balt...

Hemimorphite - White/Colorless, Classic locality (Mexico)

Hemimorphite

Hemimorphite - White/Colorless, Classic locality (Mexico)

San Antonio Mine, East Camp, Santa Eulalia Mining ...

Brucite - Intensely Saturated Yellow - Pakistan

Brucite

Brucite - Intensely Saturated Yellow - Pakistan

Qilla Saifullah District in Balochistan Province, ...

Pyrite - Octahedral with Snow-on-the-Roof Sphalerite - Huanzala Mine

Pyrite

Pyrite - Octahedral with Snow-on-the-Roof Sphalerite - Huanzala Mine

Huanzala Mine, Peru

Pollucite - Ice-Clear Etched

Pollucite

Pollucite - Ice-Clear Etched

Pegmatites of Afghanistan

Legrandite - Exceptional Single-Crystal with Perpendicular Accent

Legrandite

Legrandite - Exceptional Single-Crystal with Perpendicular Accent

Ojuela Mine, Mapimí, Mapimí Mun., Durango, Mexico

Selenite - Water-Clear with Perfect Termination - New Find, Durango, Mexico

Selenite

Selenite - Water-Clear with Perfect Termination - New Find, Durango, Mexico

Durango, Mexico

Amethyst Crystal Cluster with Centered Termination - Veracruz

Amethyst (Quartz)

Amethyst Crystal Cluster with Centered Termination - Veracruz

Las Vigas, Veracruz, Mexico

Fluorite - Color-Changing Green-Blue

Fluorite

Fluorite - Color-Changing Green-Blue

Cousin Jack Pocket, Rogerley Mine, England

Gem Pederneira Watermelon Tourmaline

Tourmaline (Elbaite)

Gem Pederneira Watermelon Tourmaline

Rocket Pocket, Pederneira Mine, Sao Jose da Safira...

Massive Fluorite Cube on Matrix Ex-Museum

Fluorite

Massive Fluorite Cube on Matrix Ex-Museum

Nikolaevskiy Mine, Dalnegorsk, Primorsky Krai, Rus...

Gem Elbaite Tourmaline Bicolor Aquamarine to Pink

Tourmaline (Elbaite)

Gem Elbaite Tourmaline Bicolor Aquamarine to Pink

PKS Mine, Cruzeiro Mountain, Minas Gerais, Brazil

Celestine (Uncommon Locality)

Celestine / Celestite

Celestine (Uncommon Locality)

Limestone Quarries, Rüdersdorf bei Berlin, Märkisc...

Flawless Epidote (Old Classic Material)

Epidote

Flawless Epidote (Old Classic Material)

Knappenwand area, Untersulzbach valley, Salzburg, ...

Large Axinite Blade on Matrix

Axinite

Large Axinite Blade on Matrix

Rasko Mine, Baluchistan Province, Pakistan

Jeremejevite Large Crystal

Jeremejevite

Jeremejevite Large Crystal

Erongo Mountain, Usakos & Omaruru District, Namibi...

Dioptase

Dioptase

Dioptase

Kaokoveld Plateau, Kunene Region, Namibia

Ludlamite Cluster on Siderite

Ludlamite

Ludlamite Cluster on Siderite

Sao Gabriel da Cachoeira, Amazonas, Brazil

Tetrahedrite

Tetrahedrite

Tetrahedrite

Huarochiri Province, Lima Department, Peru