SKU: SKU:LPNLMCOSGRY618COR
MSI 6x18 Cosmic Gray Stacked Stone Corner Piece
MSI 6x18 Cosmic Gray Stacked Stone Corner Piece
(6.0 sq.ft.)
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*We recommend adding an additional 15% to your overall square footage calculations to ensure you have enough coverage for waste and reserve during the installation process.
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Total price: $54.72
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🏛️ THE DESIGN IDENTITY
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The Archetype: The "Industrial Wrap" of the Collection.
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The Contrast: Instead of leaving rough, raw, saw-cut edges exposed or attempting tricky hand-mitered cuts that shatter the stone, this pre-formed unit ensures a perfectly seamless perimeter turn.
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Design Aesthetics: The premier choice for Modern Industrial, Urban Minimalist, or Sleek Monochromaticarchitecture.
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The Mineral Field: Crafted from fine natural marble featuring a cool, creamy light-gray background mixed with shifting shades of smoke and slate.
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The Visual Flow: Features an L-shaped corner structure with a rugged split-face texture that wraps structural columns, pillars, and fireplace ends with professional stone masonry.
🏷️ PRODUCT TITLE
RockMount™ Stacked Stone Collection: Cosmic Gray 6" x 18" Natural Marble Splitface Corner Ledger Panel
📝 PRODUCT DESCRIPTION
Complete your dimensional stone veneer project with the architectural precision of the Cosmic Gray Splitface Corner Ledger Panel. Sourced and precision-sorted by global surface innovator MSI, this pre-formed L-shaped component is engineered to partner seamlessly with standard 6" x 24" flat ledger rows. By removing the need for painstaking field cutting or manual edge grinding, it delivers a clean, professional 90-degree outer corner that saves critical labor hours.
Each modular 6" x 18" corner format features rows of hand-cleft natural marble fragments structurally bonded to wrap external corners like a puzzle piece. The "Cosmic Gray" colorway provides an upscale, multi-tonal light-gray canvas that adds texture and dramatic shadow relief without relying on dark, heavy slates. Fully approved for interior and exterior masonry cladding, it is the essential component for wrapping fireplace columns, outer room dividers, structural pillars, and outdoor barbecue ends.
✨ KEY FEATURES
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Pre-Formed "L" Outer Corner: Provides a clean 90-degree factory turn that masks raw stone edges and avoids complicated field mitering.
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Genuine High-Grade Marble: Solid natural marble stone delivers exceptional architectural prestige and outlasts faux-concrete options.
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Rugged Split-Face Texture: Variable cleft depths create deep relief shadows that intensify when framed by directional accent lighting.
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All-Weather Armor: Completely frost-proof and structurally stable under heavy UV exposure, making it rated for freezing outdoor zones.
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Grout-Free Interlocking Grid: Designed for tight, flush placement, ensuring an unbroken, dry-stacked stone landscape.
📊 SPECIFICATIONS
| Technical Property | Details |
|---|---|
| Collection | RockMount™ Stacked Stone Panels |
| Product Line / Color | Cosmic Gray |
| Brand / Manufacturer | MSI / MS International |
| Material Type | 100% Authentic Natural Marble |
| Panel Format | 6" x 18" Pre-Formed "L" Corner Panel |
| Coverage Area | 0.75 Sq. Ft. per piece |
| Thickness Range | 0.50" to 0.75" (Variable Depth Profile) |
| Surface Finish | Split-Face / Natural Cleft |
| Packaging | 6 Pieces per box / 4.5 Sq. Ft. coverage |
| Weight | Approx. 5.28 Lbs per piece / 31.68 Lbs per box |
| Application | Fireplace Edges / Structural Columns / Outdoor BBQ Corners / Accent Wall Outer Turns |
| Certifications | GREENGUARD Gold / USGBC LEED Certified |
🛠️ INSTALLATION REQUIREMENTS
⚠️ CRITICAL: BACKING COHESION & MORTAR COLOR
Because pre-formed stone corners focus heavy natural weight on a vertical outer edge, they must be mounted exclusively to a rigid cement backer-board or clean masonry substrate. Never attach them directly to residential drywall. A high-performance, polymer-modified White Thinset Mortar is requiredto secure a safe, lifelong bond and prevent dark adhesive from shadowing through the gray-and-white marble lines.
Manufacturer Recommendations
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Groutless Dry-Stack System: Do not apply grout over the split-face stone pieces. Simply push the puzzle-cut edges tightly together against the wall and matching flat panels.
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Sealing Mandate: Apply a high-quality, non-color-enhancing solvent penetrating sealer across the corner stones after the mortar cures. This acts as a barrier against fireplace soot, grilling oils, or weather elements without changing the stone's light-gray hue.
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Dry-Cutting Dust Hazard: Cutting natural stone creates silica dust. Always utilize a wet tile saw equipped with a continuous diamond blade to control dust particles and keep individual stone strips from separating.
💡 PRO INSTALLATION TIPS
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Corner-First Strategy: When tiling columns or walls, always place your 6" x 18" corner pieces first. Level them carefully, and then work your standard 6" x 24" flat ledger sheets outward from the corner. This keeps all trimmed cut edges hidden along the less-visible interior boundaries of your wall.
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Stagger the Corner Alternations: Alternate the direction of the long and short legs of the corner panels with every row you climb. This breaks up vertical seam tracking and unifies the stone layout so it looks like authentic hand-laid stone block architecture.
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100% Back-Butter Coverage: Use the flat side of your trowel to back-butter the entire reverse side of every corner panel before locking it into the combed thinset bed. This eliminates hollow air spaces along the critical 90-degree edge.
💬 FREQUENTLY ASKED QUESTIONS
Q: How do I calculate how many corner pieces to order?
A: Corner pieces are sold by the individual unit and extend vertically. Measure the exact height of your outer 90-degree corner in inches and divide by 6 (since each corner panel is 6 inches tall) to find the exact piece count needed.
Q: Can this split-face marble piece handle freezing outdoor winter conditions?
A: Yes, absolutely. True vitrified marble holds up exceptionally well against extreme thermal cycles, making it fully approved for exterior home pillars, landscaping retaining walls, and outdoor patios.
Q: Why should I choose pre-formed corners instead of cutting them myself?
A: Standard split-face flat ledger panels vary significantly in depth. Attempting to manually miter flat sheets in the field results in uneven, mismatched cleft edges and heavy stone chipping. Factory corners ensure a seamless layout.
Shade Variation
Shade Variation
Colors and textures may vary slightly between tile batches due to natural manufacturing variations. For a clear representation, we recommend ordering a sample. Learn more.

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Processing & Shipping
- Orders take 48 hours to process and about a week to be delivered depending on your location.
- Orders may come in multiple packages and may be delivered separately.
- All freight orders require a signature at time of delivery.
- All freight orders are delivered curbside.