Natural Stone is a solid composite of one or more natural minerals which combine in a complex geological process to form one of the three major groups of stone defined as Igneous, Sedimentary and Metamorphic.
In the world of Architecture and Construction PBM partners with quarries from around the world to bring these materials to our 5 locations in the Bay Area; Flagstone, Cut/Dimensional Paving, Full Stone, Thin Veneer, Caps/Sills/Treads and various other products. Come, Explore, Discover.

Tumbled McGregor LakeTumbled McGregor Lake

Tumbled McGregor Lake

A customer favorite, McGregor Lake is an argillite stone quarried from a cliff formation in Northwest Montana.

This stone is visually stunning because of its light grey color with softened blushes of gold, bronze and tan. Tumbled McGregor Lake, through the tumbling process produces colors that are much more restrained.

What makes McGregor Lake truly special are the natural dendrite fern patterns! Each piece is like a work of art.

McGregor Lake is so versatile because of its color palette as well as choices in shape and cut which allows you to use the stone in both interior and exterior applications.

Available in

  • Ledgestone - parallel tops and bottoms, with natural ends 2 - 8" heights and 3 - 18" lengths
  • Stack Stone - lineal, low profiles 1 - 3" heights and 3 - 10" lengths
  • Cottage Blend - blend of natural lineal and random shapes
  • Ashlar - linear profile, cut tops and bottoms 2 - 6" heights and 3 - 18" lengths
  • Square & Rectangles - Larger faces with parallel tops and bottoms and natural ends 6 - 10" heights, 6 - 24" lengths
  • Tumbled - softened edges, parallel tops and bottoms with natural ends 2 - 8" heights and 3 - 18" lengths

Natural stone products vary in color over time.
Visit our Showroom or material yards today to get a sample of current color ranges available.

A customer favorite, McGregor Lake is an argillite stone quarried from a cliff formation in Northwest Montana.

This stone is visually stunning because of its light grey color with softened blushes of gold, bronze and tan. Tumbled McGregor Lake, through the tumbling process produces colors that are much more restrained.

What makes McGregor Lake truly special are the natural dendrite fern patterns! Each piece is like a work of art.

McGregor Lake is so versatile because of its color palette as well as choices in shape and cut which allows you to use the stone in both interior and exterior applications.

Available in

  • Ledgestone - parallel tops and bottoms, with natural ends 2 - 8" heights and 3 - 18" lengths
  • Stack Stone - lineal, low profiles 1 - 3" heights and 3 - 10" lengths
  • Cottage Blend - blend of natural lineal and random shapes
  • Ashlar - linear profile, cut tops and bottoms 2 - 6" heights and 3 - 18" lengths
  • Square & Rectangles - Larger faces with parallel tops and bottoms and natural ends 6 - 10" heights, 6 - 24" lengths
  • Tumbled - softened edges, parallel tops and bottoms with natural ends 2 - 8" heights and 3 - 18" lengths

Natural stone products vary in color over time.
Visit our Showroom or material yards today to get a sample of current color ranges available.

Stay Connected

Please send me a monthly update on
products and related industry events.