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
Blue Aragonite – Vivid Sky-Blue Botryoidal Plate with Smooth Satiny Luster

Aragonite

Blue Aragonite – Vivid Sky-Blue Botryoidal Plate with Smooth Satiny Luster

Yunnan Province, China

Quartz – Flawlessly Clear Bright Lustrous Centered Crystal on Aesthetic Matrix

Quartz

Quartz – Flawlessly Clear Bright Lustrous Centered Crystal on Aesthetic Matrix

India

Baryte – Complete Double-Terminated Floater with Exceptional Gemminess and Natural Etching

Barite

Baryte – Complete Double-Terminated Floater with Exceptional Gemminess and Natural Etching

Linwood Mine, Buffalo, Scott County, Iowa, USA

Baryte – Exceptionally Gemmy Naturally Etched Crystal from the 2025 Portal Pocket

Barite

Baryte – Exceptionally Gemmy Naturally Etched Crystal from the 2025 Portal Pocket

Linwood Mine, Buffalo, Scott County, Iowa, USA

Halite on Matrix with Sylvite – Deep Blue Perfect Cube Elegantly Perched on Contrasting Matrix

Halite

Halite on Matrix with Sylvite – Deep Blue Perfect Cube Elegantly Perched on Contrasting Matrix

Potash Mines, Carlsbad, Eddy County, New Mexico, U...

Axinite – Large Clove-Brown Bladed Crystal Plate on Custom Acrylic Base

Axinite

Axinite – Large Clove-Brown Bladed Crystal Plate on Custom Acrylic Base

Raipa Mine, Aija Province, Ancash Department, Peru

Gypsum var. Selenite – Monumental Gemmy Sword Crystal Cluster with Elongated Transparent Blades

Selenite

Gypsum var. Selenite – Monumental Gemmy Sword Crystal Cluster with Elongated Transparent Blades

Wenshan, Yunnan Province, China

Crocoite on Hematite – Large Translucent Red-Orange Terminated Crystal on Botryoidal Metallic Matrix

Crocoite

Crocoite on Hematite – Large Translucent Red-Orange Terminated Crystal on Botryoidal Metallic Matrix

Dundas, Tasmania, Australia

Calcite – Monumental Nail-Head Crystal Cluster with Sharp Undamaged Terminations and Custom Acrylic Base

Calcite

Calcite – Monumental Nail-Head Crystal Cluster with Sharp Undamaged Terminations and Custom Acrylic Base

Wenshan Mine, Wenshan City, Wenshan, Yunnan, China

Quartz var. Mango Quartz with Halloysite – Intricate Lustrous Needle Cluster with Saturated Orange-Yellow Terminations

Quartz (Mango/Halloysite)

Quartz var. Mango Quartz with Halloysite – Intricate Lustrous Needle Cluster with Saturated Orange-Yellow Terminations

Boyacá Department, Colombia

Celestine – Sky-Blue Geode Cluster with Gemmy Prismatic Crystals and Saturated Blue Terminations

Celestine / Celestite

Celestine – Sky-Blue Geode Cluster with Gemmy Prismatic Crystals and Saturated Blue Terminations

Sankoany, Ketsepy, Mahajanga Province, Madagascar

Epidote – Lustrous Forest-Green Crystal Cluster with Sharp Terminations and Gemmy Yellow-Green Highlights

Epidote

Epidote – Lustrous Forest-Green Crystal Cluster with Sharp Terminations and Gemmy Yellow-Green Highlights

Kharan District, Balochistan Province, Pakistan

Titanite with Actinolite on Calcite – Gem Honey-Golden Twin Crystal on Matrix

Titanite

Titanite with Actinolite on Calcite – Gem Honey-Golden Twin Crystal on Matrix

Mulla Ghori, Khyber District, Khyber Pakhtunkhwa, ...

Gypsum var. Selenite - Gem with Red Matrix Inclusions

Selenite

Gypsum var. Selenite - Gem with Red Matrix Inclusions

Bermejillo, Durango, México

Calcite with Pyrolusite Inclusions – Gem-Clear Prismatic Crystals with Dramatic Black Internal Landscapes

Calcite

Calcite with Pyrolusite Inclusions – Gem-Clear Prismatic Crystals with Dramatic Black Internal Landscapes

Yongkang, Jinhua Prefecture, Zhejiang Province, Ch...

Apophyllite – Sparkling Gemmy Druzy Plate with Sculptural White Terminated Crystals

Apophyllite

Apophyllite – Sparkling Gemmy Druzy Plate with Sculptural White Terminated Crystals

Maharashtra, India

Calcite – Rare Gemmy Green Tabular Crystal on Druzy Matrix

Calcite

Calcite – Rare Gemmy Green Tabular Crystal on Druzy Matrix

Tonglüshan District, Daye, Hubei Province, China

Fluorite – Large Gemmy Pale Blue-Lavender Cubic Crystal with Phantom Zoning

Fluorite

Fluorite – Large Gemmy Pale Blue-Lavender Cubic Crystal with Phantom Zoning

Yaogangxian Mine, Yizhang County, Chenzhou Prefect...

Celestite – World-Class Gemmy Sky-Blue Transparent Crystal Cluster with Prominent Central Prism

Celestine / Celestite

Celestite – World-Class Gemmy Sky-Blue Transparent Crystal Cluster with Prominent Central Prism

Sakoany Deposit, Katsepy, Mitsinjo District, Boeny...

Aquamarine – Exceptional Gem-Quality Ultra-Clear Terminated Crystal

Aquamarine (Beryl)

Aquamarine – Exceptional Gem-Quality Ultra-Clear Terminated Crystal

Shigar Valley, Skardu District, Gilgit-Baltistan, ...

Quartz - Hematite-Included, Lustrous Brick-Red Multi-Generational Crystal Cluster

Quartz

Quartz - Hematite-Included, Lustrous Brick-Red Multi-Generational Crystal Cluster

Izizauen, Alnif, Tarhbalt, Tinghir Province, Drâa-...

Carrollite – Exceptional Single-Crystal – Mirror-Luster Octahedral Form with Sculptural Perfection

Carrollite

Carrollite – Exceptional Single-Crystal – Mirror-Luster Octahedral Form with Sculptural Perfection

Kamoya South II Mine, Kamoya, Kambove, Kambove Ter...

Red Zircon on Matrix

Zircon

Red Zircon on Matrix

Shigar Valley, Shigar District, Gilgit-Baltistan, ...

Red Zircon on Matrix

Zircon

Red Zircon on Matrix

Shigar Valley, Shigar District, Gilgit-Baltistan, ...

Red Zircon on Matrix

Zircon

Red Zircon on Matrix

Shigar Valley, Shigar District, Gilgit-Baltistan, ...

Fluorite - Green, Clear Cube Conglomerate

Fluorite

Fluorite - Green, Clear Cube Conglomerate

Xianghualing Mine, Xianghualing Sn-polymetallic or...

Halite - Monumental, Museum-Scale Cubic Crystals with Exceptional Ice-Clear Transparency,

Halite

Halite - Monumental, Museum-Scale Cubic Crystals with Exceptional Ice-Clear Transparency,

Wieliczka Mine, Wieliczka County, Lesser Poland Vo...

Quartz Faden – Elongated Skeletal Crystal with Pronounced Central Faden Line and Stepped Growth

Quartz

Quartz Faden – Elongated Skeletal Crystal with Pronounced Central Faden Line and Stepped Growth

Dera Ismail Khan District, Khyber Pakhtunkhwa Prov...

Baryte – Historic Hematite-Included Bladed Crystals with Red Zoning, 1800's Frizington Classic

Barite

Baryte – Historic Hematite-Included Bladed Crystals with Red Zoning, 1800's Frizington Classic

Frizington, Arlecdon and Frizington, Copeland, Cum...

Crocoite – Fiery Red-Orange Radiating Acicular Crystal Aggregate, Classic Dundas

Crocoite

Crocoite – Fiery Red-Orange Radiating Acicular Crystal Aggregate, Classic Dundas

Dundas, Zeehan District, Tasmania, Australia

Schorl Tourmaline – Sculptural Parallel Growth Cluster with Precision Striations, Dara-e-Pech Cabinet Piece

Tourmaline (Schorl)

Schorl Tourmaline – Sculptural Parallel Growth Cluster with Precision Striations, Dara-e-Pech Cabinet Piece

Dara-e-Pech Pegmatite Field, Dara-e-Pech District,...

Elbaite Tourmaline – Slender Bi-Color Prism with Pale Cap and Razor Termination, Dara-e-Pech Classic

Tourmaline (Elbaite)

Elbaite Tourmaline – Slender Bi-Color Prism with Pale Cap and Razor Termination, Dara-e-Pech Classic

Dara-e-Pech Pegmatite Field, Dara-e-Pech District,...

Rose Quartz on Albite – Exceptional Large, Single, Doubly-Terminated Crystal

Quartz (Rose)

Rose Quartz on Albite – Exceptional Large, Single, Doubly-Terminated Crystal

Taquaral, Itinga, Minas Gerais, Brazil

Elbaite Tourmaline – Lemon Pocket, Gem Crystal with Rare Yellow Zoning

Tourmaline (Elbaite)

Elbaite Tourmaline – Lemon Pocket, Gem Crystal with Rare Yellow Zoning

Coronel Murta, Minas Gerais, Brazil

Baryte – Exceptional Gem-Clear Double-Terminated Honey Crystal on Matrix

Barite

Baryte – Exceptional Gem-Clear Double-Terminated Honey Crystal on Matrix

Linwood Mine, Buffalo, Scott County, Iowa, USA

Baryte – Gem-Clear Honey-Colored Tabular Crystal Cluster

Barite

Baryte – Gem-Clear Honey-Colored Tabular Crystal Cluster

Linwood Mine, Buffalo, Scott County, Iowa, USA